Author: "Charlot, X." - Searchworks@Jio Institute Digital Library Search Results

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121 results on '"Charlot, X."'

1. New Magellanic Cloud R Coronae Borealis and DY Per type stars from the EROS-2 database: the connection between RCBs, DYPers and ordinary carbon stars

Author: Tisserand, P., Wood, P. R., Marquette, J. B., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Beaulieu, J. P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Gros, M., de Kat, J., Lesquoy, E., Loup, C., Magneville, C., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rich, J., Schwemling, P., Spiro, M., and Vidal-Madjar, A.
Subjects: Astrophysics - Solar and Stellar Astrophysics
Abstract: R Coronae Borealis stars (RCB) are a rare type of evolved carbon-rich supergiant stars that are increasingly thought to result from the merger of two white dwarfs, called the Double degenerate scenario. This scenario is also studied as a source, at higher mass, of type Ia Supernovae (SnIa) explosions. Therefore a better understanding of RCBs composition would help to constrain simulations of such events. We searched for and studied RCB stars in the EROS Magellanic Clouds database. We also extended our research to DY Per type stars (DYPers) that are expected to be cooler RCBs (T~3500 K) and much more numerous than their hotter counterparts. The light curves of ~70 millions stars have been analysed to search for the main signature of RCBs and DYPers: a large drop in luminosity. Follow-up optical spectroscopy was used to confirm each photometric candidate found. We have discovered and confirmed 6 new Magellanic Cloud RCB stars and 7 new DYPers, but also listed new candidates: 3 RCBs and 14 DYPers. We estimated a range of Magellanic RCB shell temperatures between 360 and 600 K. We confirm the wide range of absolute luminosity known for RCB stars, M_V~-5.2 to -2.6. Our study further shows that mid-infrared surveys are ideal to search for RCB stars, since they have thinner and cooler circumstellar shells than classical post-AGB stars. In addition, by increasing the number of known DYPers by ~400%, we have been able to shed light on the similarities in the spectral energy distribution between DYPers and ordinary carbon stars. We also observed that DYPer circumstellar shells are fainter and hotter than those of RCBs. This suggests that DYPers may simply be ordinary carbon stars with ejection events, but more abundance analysis is necessary to give a status on a possible evolutionnary connexion between RCBs and DYPers., Comment: 22 pages, 38 figures, Accepted for publication in A&A
Published: 2009
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2. The EROS2 search for microlensing events towards the spiral arms: the complete seven season results

Author: Rahal, Y. R., Afonso, C., Albert, J. -N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Beaulieu, J. -P., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouqué, P., Glicenstein, J. -F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lesquoy, E., Loup, C., Guillou, L. Le, Magneville, C., Mansoux, B., Marquette, J. -B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahvar, S., Rich, J., Spiro, M., Tisserand, P., and Vidal-Madjar, A.
Subjects: Astrophysics - Astrophysics of Galaxies
Abstract: The EROS-2 project has been designed to search for microlensing events towards any dense stellar field. The densest parts of the Galactic spiral arms have been monitored to maximize the microlensing signal expected from the stars of the Galactic disk and bulge. 12.9 million stars have been monitored during 7 seasons towards 4 directions in the Galactic plane, away from the Galactic center. A total of 27 microlensing event candidates have been found. Estimates of the optical depths from the 22 best events are provided. A first order interpretation shows that simple Galactic models with a standard disk and an elongated bulge are in agreement with our observations. We find that the average microlensing optical depth towards the complete EROS-cataloged stars of the spiral arms is $\bar{\tau} =0.51\pm .13\times 10^{-6}$, a number that is stable when the selection criteria are moderately varied. As the EROS catalog is almost complete up to $I_C=18.5$, the optical depth estimated for the sub-sample of bright target stars with $I_C<18.5$ ($\bar{\tau}=0.39\pm >.11\times 10^{-6}$) is easier to interpret. The set of microlensing events that we have observed is consistent with a simple Galactic model. A more precise interpretation would require either a better knowledge of the distance distribution of the target stars, or a simulation based on a Galactic model. For this purpose, we define and discuss the concept of optical depth for a given catalog or for a limiting magnitude., Comment: 22 pages submitted to Astronomy & Astrophysics
Published: 2009
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3. The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database

Author: Marquette, J. B., Beaulieu, J. P., Buchler, J. R., Szabo, R., Tisserand, P., Belghith, S., Fouque, P., Lesquoy, E., Milsztajn, A., Schwarzenberg-Czerny, A., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Charlot, X., Coutures, C., Ferlet, R., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Guillou, L. Le, Loup, C., Magneville, C., Maurice, E., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., and Vidal-Madjar, A.
Subjects: Astrophysics - Solar and Stellar Astrophysics
Abstract: A number of microlensing dark-matter surveys have produced tens of millions of light curves of individual background stars. These data provide an unprecedented opportunity for systematic studies of whole classes of variable stars and their host galaxies. We aim to use the EROS-2 survey of the Magellanic Clouds to detect and study the population of beat Cepheids (BCs) in both Clouds. BCs pulsating simultaneously in the first overtone and fundamental modes (FO/F) or in the second and first overtone modes (SO/FO) are of particular interest. Using special software designed to search for periodic variables, we have scanned the EROS-2 data base for variables in the typical period range of Cepheids. Metallicities of FO/F objects were then calculated from linear nonadiabatic convective stellar models. We identify 74 FO/F BCs in the LMC and 41 in the SMC, and 173 and 129 SO/FO pulsators in the LMC and SMC, respectively; 185 of these stars are new discoveries. For nearly all the FO/F objects we determine minimum, mean, and maximum values of the metallicity. The EROS data have expanded the samples of known BCs in the LMC by 31%, in the SMC by 110%. The FO/F objects provide independent measures of metallicities in these galaxies. The mean value of metallicity is 0.0045 in the LMC and 0.0018 in the SMC., Comment: 10 pages, 7 figures, accepted for publication in A&A
Published: 2009
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4. Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud

Author: Marquette, J. B., Tisserand, P., Francois, P., Beaulieu, J. P., Doublier, V., Lesquoy, E., Milsztajn, A., Pritchard, J., Schwarzenberg-Czerny, A., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Charlot, X., Coutures, C., Ferlet, R., Fouque, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Guillou, L. Le, Loup, C., Magneville, C., Maurice, E., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., Vidal-Madjar, A., and Zylberajch, S.
Subjects: Astrophysics
Abstract: For seven years, the EROS-2 project obtained a mass of photometric data on variable stars. We present a peculiar Cepheid-like star, in the direction of the Small Magellanic Cloud, which demonstrates unusual photometric behaviour over a short time interval. We report on data of the photometry acquired by the MARLY telescope and spectroscopy from the EFOSC instrument for this star, called EROS2 J005135-714459(sm0060n13842), which resembles the unusual Cepheid HR 7308. The light curve of our target is analysed using the Analysis of Variance method to determine a pulsational period of 5.5675 days. A fit of time-dependent Fourier coefficients is performed and a search for proper motion is conducted. The light curve exhibits a previously unobserved and spectacular change in both mean magnitude and amplitude, which has no clear theoretical explanation. Our analysis of the spectrum implies a radial velocity of 104 km s$^{-1}$ and a metallicity of -0.4$\pm$0.2 dex. In the direction of right ascension, we measure a proper motion of 17.4$\pm$6.0 mas yr$^{-1}$ using EROS astrometry, which is compatible with data from the NOMAD catalogue. The nature of EROS2 J005135-714459(sm0060n13842) remains unclear. For this star, we may have detected a non-zero proper motion for this star, which would imply that it is a foreground object. Its radial velocity, pulsational characteristics, and photometric data, however, suggest that it is instead a Cepheid-like object located in the SMC. In such a case, it would present a challenge to conventional Cepheid models., Comment: Correction of typos in the abstract
Published: 2008
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5. R Coronae Borealis stars in the Galactic Bulge discovered by EROS-2

Author: Tisserand, P., Marquette, J. B., Wood, P. R., Lesquoy, E., Beaulieu, J. P., Milsztajn, A., Hamadache, C., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Gros, M., Haissinski, J., de Kat, J., Guillou, L. Le, Loup, C., Magneville, C., Maurice, E., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y., Rich, J., Spiro, M., Vidal-Madjar, A., and Zylberajch, S.
Subjects: Astrophysics
Abstract: Rare types of variable star may give unique insight into short-lived stages of stellar evolution. The systematic monitoring of millions of stars and advanced light curve analysis techniques of microlensing surveys make them ideal for discovering also such rare variable stars. One example is the R Coronae Borealis (RCB) stars, a rare type of evolved carbon-rich supergiant. We have conducted a systematic search of the EROS-2 database for the Galactic catalogue Bulge and spiral arms to find Galactic RCB stars. The light curves of $\sim$100 million stars, monitored for 6.7 years (from July 1996 to February 2003), have been analysed to search for the main signature of RCB stars, large and rapid drops in luminosity. Follow-up spectroscopy has been used to confirm the photometric candidates. We have discovered 14 new RCB stars, all in the direction of the Galactic Bulge, bringing the total number of confirmed Galactic RCB stars to about 51. After reddening correction, the colours and absolute magnitudes of at least 9 of the stars are similar to those of Magellanic RCB stars. This suggests that these stars are in fact located in the Galactic Bulge, making them the first RCB stars discovered in the Bulge. The localisation of the 5 remaining RCBs is more uncertain: 4 are either located behind the Bulge at an estimated maximum distance of 14 kpc or have an unusual thick circumstellar shell; the other is a DY Per RCB which may be located in the Bulge, even if it is fainter than the known Magellanic DY Per. From the small scale height found using the 9 new Bulge RCBs, $61
Published: 2008
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6. Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds

Author: Tisserand, P., Guillou, L. Le, Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Beaulieu, J. P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Marquette, J. B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Subjects: Astrophysics
Abstract: The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called ``machos'') could be a major component of the dark matter halo of the Milky Way galaxy. To this end, EROS-2 monitored over 6.7 years $33\times10^6$ stars in the Magellanic clouds for microlensing events caused by such objects. In this work, we use only a subsample of $7\times10^6$ bright stars spread over $84 \deg^2$ of the LMC and $9 \deg^2$ of the SMC. The strategy of using only bright stars helps to discriminate against background events due to variable stars and allows a simple determination of the effects of source confusion (blending). The use of a large solid angle makes the survey relatively insensitive to effects that could make the optical depth strongly direction dependent. Using this sample of bright stars, only one candidate event was found, whereas $\sim39$ events would have been expected if the Halo were entirely populated by objects of mass $M\sim0.4M_{\odot}$. Combined with the results of EROS-1, this implies that the optical depth toward the Large Magellanic Cloud (\object{LMC}) due to such lenses is $\tau<0.36\times10^{-7}$ (95%CL), corresponding to a fraction of the halo mass of less than 8%. This optical depth is considerably less than that measured by the MACHO collaboration in the central region of the LMC. More generally, machos in the mass range $0.6\times10^{-7}M_\odot
Published: 2006
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7. Galactic Bulge Microlensing Optical Depth from EROS-2

Author: Hamadache, C., Guillou, L. Le, Tisserand, P., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Beaulieu, J. P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., de Kat, J., Lesquoy, E., Loup, C., Magneville, C., Marquette, J. B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Subjects: Astrophysics
Abstract: We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of $5.6\times 10^{6}$ clump-giant stars distributed over $66 \deg^2$ of the Bulge were monitored during seven Bulge seasons. 120 events were found with apparent amplifications greater than 1.6 and Einstein radius crossing times in the range $5 {\rm d}
Published: 2006
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8. Type Ia supernova rate at a redshift of ~ 0.1

Author: Blanc, G., Afonso, C., Alard, C., Albert, J. N., Aldering, G., Amadon, A., Andersen, J., Ansari, R., Aubourg, E., Balland, C., Bareyre, P., Beaulieu, J. P., Charlot, X., Conley, A., Coutures, C., Dahlen, T., Derue, F., Fan, X., Ferlet, R., Folatelli, G., Fouque, P., Garavini, G., Glicenstein, J. F., Goldman, B., Goobar, A., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., Hardin, D., Hook, I. M., deKat, J., Kent, S., Kim, A., Lasserre, T., LeGuillou, L., Lesquoy, E., Loup, C., Magneville, C., Marquette, J. B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Mouchet, M., Newberg, H., Nobili, S., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Rahal, Y. R., Regnault, N., Rich, J., Ruiz-Lapuente, P., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Walton, N. A., and Zylberajch, S.
Subjects: Astrophysics
Abstract: We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type Ia supernova explosion rate at a redshift ~ 0.13. The result is $0.125^{+0.044+0.028}_{-0.034-0.028} h_{70}^2$ SNu where 1 SNu = 1 SN / $10^{10} L_{sun}^B$ / century. This value is compatible with the previous EROS measurement (Hardin et al. 2000), done with a much smaller sample, at a similar redshift. Comparison with other values at different redshifts suggests an evolution of the type Ia supernova rate., Comment: Accepted for publication in Astronomy & Astrophysics (15 pages, 16 figures)
Published: 2004
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9. Type Ia supernova rate at $z \sim 0.1$

Author: Hardin, D., Afonso, C., Alard, C., Albert, J. N., Amadon, A., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Bauer, F., Beaulieu, J. P., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamilton, J. C., de Kat, J., Kim, A., Lasserre, T., Lesquoy, É., Loup, C., Magneville, C., Mansoux, B., Marquette, J. B., Maurice, É., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., and collaboration, The EROS
Subjects: Astrophysics
Abstract: We present the EROS nearby supernova ($z \sim 0.02 - 0.2$) search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernov{\ae} were detected, four of which were spectroscopically identified as type Ia supernov{\ae}. The search efficiency was determined with a Monte-Carlo simulation taking into account the efficiencies for both supernova detection and host galaxy identification. Assuming that for a given galaxy the supernova rate is proportional to the galactic luminosity, we compute a type Ia supernova explosion rate of: ${\cal R} = 0.44 {}_{-0.21}^{+0.35} {}_{-0.07}^{+0.13} h^2: / 10^{10} \lbsun / 100 {\rm yrs}$ at an average redshift of $\sim 0.1$ where the errors are respectively statistical and systematic (type misidentification included)., Comment: 8 pages, 6 figures, accepted in A&A
Published: 2000

10. Type Ia supernova rate at a redshift of ~;0.1

Author: Blanc, G., Afonso, C., Alard, C., Albert, J.N., Aldering, G., Amadon, A., Andersen, J., Ansari, R., Aubourg, E., Balland, C., Bareyre, P., Beaulieu, J.P., Charlot, X., Conley, A., Coutures, C., Dahlen, T., Derue, F., Fan, X., Ferlet, R., Folatelli, G., Fouque, P., Garavini, G., Glicenstein, J.F., Goldman, B., Goobar, A., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., Hardin, D., Hook, I.M., deKat, J., Kent, S., Kim, A., Lasserre, T., LeGuillou, L., Lesquoy, E., Loup, C., Magneville, C., Marquette, J.B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Mouchet, M., Newberg, H., Nobili, S., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Rahal, Y.R., Regnault, N., Rich, J., Ruiz-Lapuente, P., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Walton, N.A., and Zylberajch, S.
Subjects: Supernova
Published: 2004

11. MegaCam: The next generation wide-field camera for CFHT

Author: de Kat, J., Aune, S., Boulade, O., Borgeaud, P., Carton, P.-H., Carty, M., Charlot, X., Desforge, D., Eppellé, D., Gallais, P., Gosset, L., Granelli, R., Gros, M., Loiseau, D., Miélot, C., Ritou, J.-L., Roussé, J.-Y., Starzynski, P., Vignal, N., Vigroux, L., Amico, Paola, editor, and Beletic, James W., editor
Published: 2000
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12. The Two EROS 4k x 8k CCD Mosaic Cameras

Author: Bauer, F., De Kat, J., Afonso, C., Aubourg, E., Aune, S., Bareyre, P., Bouere, A., Charlot, X., Coutures, C., Delabrouille, N., Dispau, G., Eppelle, D., Gachelin, O., Gaucherel, C., Glicenstein, J. F., Goldman, B., Gros, M., Hardin, D., Jeanney, C., Lecointe, J. F., Coroller, A. Le, Lesquoy, E., Magneville, C., Milsztajn, A., Perrin, P., Pinabiau, M., Rebourgeard, P., Renault, C., Rich, J., Spiro, M., Treillard, R., de Trogoff, J., Vignal, N., Vigroux, L., Walter, C., Zylberajch, S., Albert, J. N., Ansari, R., Couchot, F., Eder, C., Lodygensky, O., Mansoux, B., Moniez, M., Perdereau, O., Adrianzyk, G., Berger, J. P., Delclite, J. C., Figuiere, C., Guillaume, C., Kohler, D., Lacroix, D., Baranne, A., Maurice, E., Beaulieu, J. P., Ferlet, R., Loup, C., Vidal-Madjar, A., Andersen, J., Beletic, James W., editor, and Amico, Paola, editor
Published: 1998
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13. MegaCam: The next generation wide-field camera for CFHT

Author: de Kat, J., primary, Aune, S., additional, Boulade, O., additional, Borgeaud, P., additional, Carton, P.-H., additional, Carty, M., additional, Charlot, X., additional, Desforge, D., additional, Eppellé, D., additional, Gallais, P., additional, Gosset, L., additional, Granelli, R., additional, Gros, M., additional, Loiseau, D., additional, Miélot, C., additional, Ritou, J.-L., additional, Roussé, J.-Y., additional, Starzynski, P., additional, Vignal, N., additional, and Vigroux, L., additional
Published: 2000
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14. The Two EROS 4k x 8k CCD Mosaic Cameras

Author: Bauer, F., primary, De Kat, J., additional, Afonso, C., additional, Aubourg, E., additional, Aune, S., additional, Bareyre, P., additional, Bouere, A., additional, Charlot, X., additional, Coutures, C., additional, Delabrouille, N., additional, Dispau, G., additional, Eppelle, D., additional, Gachelin, O., additional, Gaucherel, C., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gros, M., additional, Hardin, D., additional, Jeanney, C., additional, Lecointe, J. F., additional, Coroller, A. Le, additional, Lesquoy, E., additional, Magneville, C., additional, Milsztajn, A., additional, Perrin, P., additional, Pinabiau, M., additional, Rebourgeard, P., additional, Renault, C., additional, Rich, J., additional, Spiro, M., additional, Treillard, R., additional, de Trogoff, J., additional, Vignal, N., additional, Vigroux, L., additional, Walter, C., additional, Zylberajch, S., additional, Albert, J. N., additional, Ansari, R., additional, Couchot, F., additional, Eder, C., additional, Lodygensky, O., additional, Mansoux, B., additional, Moniez, M., additional, Perdereau, O., additional, Adrianzyk, G., additional, Berger, J. P., additional, Delclite, J. C., additional, Figuiere, C., additional, Guillaume, C., additional, Kohler, D., additional, Lacroix, D., additional, Baranne, A., additional, Maurice, E., additional, Beaulieu, J. P., additional, Ferlet, R., additional, Loup, C., additional, Vidal-Madjar, A., additional, and Andersen, J., additional
Published: 1998
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15. Type Ia supernova rate at a redshift of similar to 0.1

Author: Blanc, G, Afonso, C, Alard, C, Albert, J, Aldering, G, Amadon, A, Andersen, J, Ansari, R, Aubourg, E, Balland, C, Bareyre, P, Beaulieu, J, Charlot, X, Conley, A, Coutures, C, Dahlen, T, Derue, F, Fan, X, Ferlet, R, Folatelli, G, Fouque, P, Garavini, G, Glicenstein, J, Goldman, B, and Goobar, A
Published: 2016

16. Combined analysis of the binary lens caustic-crossing event MACHO 98-SMC-1

Author: Afonso, C, Alard, C, Albert, J N, Andersen, J, Ansari, R, Aubourg, E, Bareyre, P, Bauer, F, Beaulieu, J P, Bouquet, A, Char, S, Charlot, X, Couchot, F, Coutures, C, Derue, F, Ferlet, R, Glicenstein, J F, Goldman, B, Gould, A, Graff, D, Gros, M, Haissinski, J, Hamilton, J C, Hardin, D, de Kat, J, Kim, A, Lasserre, T, Lesquoy, E, Loup, C, Magneville, C, Marquette, J B, Maurice, E, Milsztajn, A, Moniez, M, Palanque-Delabrouille, N, Perdereau, O, Prevot, L, Regnault, N, Rich, J, Spiro, M, Vidal-Madjar, A, Vigroux, L, Zylberajch, S, Alcock, C, Allsman, R A, Alves, D, Axelrod, TS, Becker, A C, Peterson, B A, Szymanski, M, Dominik, Martin, Naber, R M, Sackett, Penny D, Kapteyn Astronomical Institute, and Astronomy
Subjects: Lens (geometry), Physics, Proper motion, MICROLENSING EVENT, 010308 nuclear & particles physics, Astrophysics (astro-ph), gravitational lensing, FOS: Physical sciences, Binary number, Astronomy and Astrophysics, Astrophysics, Mass ratio, Gravitational microlensing, 01 natural sciences, dark matter, Einstein radius, Space and Planetary Science, Limb darkening, 0103 physical sciences, Magellanic Clouds, astrometry, PHOTOMETRY, Small Magellanic Cloud, 010303 astronomy & astrophysics
Abstract: We fit the data for the binary-lens microlensing event MACHO 98-SMC-1 from 5 different microlensing collaborations and find two distinct solutions characterized by binary separation d and mass ratio q: (d,q)=(0.54,0.50) and (d,q)=(3.65,0.36), where d is in units of the Einstein radius. However, the relative proper motion of the lens is very similar in the two solutions, 1.30 km/s/kpc and 1.48 km/s/kpc, thus confirming that the lens is in the Small Magellanic Cloud. The close binary can be either rotating or approximately static but the wide binary must be rotating at close its maximum allowed rate to be consistent with all the data. We measure limb-darkening coefficients for five bands ranging from I to V. As expected, these progressively decrease with rising wavelength. This is the first measurement of limb darkening for a metal-poor A star., 29 pages + 9 figures + 2 tables, submitted to ApJ
Published: 2000

17. Removing the Microlensing Blending-Parallax Degeneracy Using Source Variability

Author: Assef, R.J., Gould, A., Afonso, C., Albert, J.N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Beaulieu, J.P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J.F., Goldman, B., Graff, D., Gros, M., Haissinski, J., Hamadache, C., De Kat, J., Le Guillou, L., Lesquoy, E., Loup, C., Magneville, C., Marquette, J.B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y.R., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Bennett, D.P., C. Becker, A., Griest, K., Vandehei, T., Welch, D.L., Udalski, A., Szymanski, M.K., Kubiak, M., Pietrzynski, G., Soszynski, I., Szewczyk, O., Wyrzykowski, L., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and EROS
Subjects: Event (relativity), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Lambda, Gravitational microlensing, 01 natural sciences, law.invention, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], law, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Lens (optics), Space and Planetary Science, Halo, Astrophysics::Earth and Planetary Astrophysics, Variable star, Degeneracy (mathematics), Parallax
Abstract: Microlensing event MACHO 97-SMC-1 is one of the rare microlensing events for which the source is a variable star, simply because most variable stars are systematically eliminated from microlensing studies. Using observational data for this event, we show that the intrinsic variability of a microlensed star is a powerful tool to constrain the nature of the lens by breaking the degeneracy between the microlens parallax and the blended light. We also present a statistical test for discriminating the location of the lens based on the \chi^2 contours of the vector \Lambda, the inverse of the projected velocity. We find that while SMC self lensing is somewhat favored over halo lensing, neither location can be ruled out with good confidence., Comment: 15 text pages + 2 tables + 7 figures. Published in the Astrophysical Journal
Published: 2006

18. Type Ia supernova rate at a redshift of similar to 0.1

Author: Blanc, G, Afonso, C, Alard, C, Albert, JN, Aldering, G, Amadon, A, Andersen, J, Ansari, R, Aubourg, E, Balland, C, Bareyre, P, Beaulieu, JP, Charlot, X, Conley, A, Coutures, C, Dahlen, T, Derue, F, Fan, X, Ferlet, R, Folatelli, G, Fouque, P, Garavini, G, Glicenstein, JF, Goldman, B, Goobar, A, Gould, A, Graff, D, Gros, M, Haissinski, J, Hamadache, C, Hardin, D, Hook, IM, de Kat, J, Kent, S, Kim, A, Lasserre, T, Le Guillou, L, Lesquoy, E, Loup, C, Magneville, C, Marquette, JB, Maurice, E, Maury, A, Milsztajn, A, Moniez, M, Mouchet, M, Newberg, H, Nobili, S, Palanque-Delabrouille, N, Perdereau, O, Prevot, L, Rahal, YR, Regnault, N, Rich, J, Ruiz-Lapuente, P, Spiro, M, Tisserand, P, Vidal-Madjar, A, Vigroux, L, Walton, NA, and Zylberajch, S
Published: 2004

19. Bulge Microlensing Optical Depth from EROS 2 observations

Author: Afonso, C., Albert, J N., Alard, C., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Beaulieu, J-P., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouque, P., Glicenstein, J-F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamache, C., Hamilton, J-C., Hardin, Doug, de Kat, J., Kim, A., Lasserre, T., Le Guillou, L., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Marquette, J-B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vogroux, L., Zylberajch, S., Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Departement d'Astrophysique Stellaire et Galactique (DASGAL), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), EROS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Departement de recherche SPAtiale (DESPA)
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: We present a measurement of the microlensing optical depth toward the Galactic bulge based on the analysis of 15 contiguous1 square degrees fields centered on (l=2.5 deg, b=-4.0 deg) and containing 1.42 million clump-giant stars (belonging to the extended clump area) monitored during almost three bulge seasons by EROS (Experience de Recherche d'Objets Sombres). We find a microlensing optical depth towards the bulge tau_bulge=0.94 +/- 0.29 10^-6 averaged over all fields, based on 16 microlensing events with clump giants as sources. This value is substantially below several other determinations by the MACHO and OGLE groups and is more in agreement with what is expected from axisymmetric and non-axisymmetric bulge models., 18 pages, 15 images, accepted for publication in A&A
Published: 2003

20. Discovery and photometry of the binary-lensing caustic-crossing event EROS-BLG-2000-5

Author: Jung, J.M, Albert, J.N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Blanc, G., Charlot, X., Couchot, F., Coutures, C., Ferlet, R., Fields, D., Fouque, P., Glicenstein, J.F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., De Kat, J., LeGuillou, L., Lesquoy, E., Loup, C., Magneville, C., Marquette, J.B., Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Rahal, Y., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and EROS
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract: The EROS collaboration has developed a real time alert system, which was operational in 1999 and 2000. A very long binary-lensing caustic crossing event, EROS-BLG-2000-5, was found in the 2000 season and monitored by EROS. EROS photometric data for this event are presented. The data are well fitted by the model of An et al. 2002 based on a completely different dataset. However, parameters of the model such as the mass ratio or the binary rotation rate are not very well constrained by EROS data., Comment: 10 pages, 6 figures
Published: 2003
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21. EROS 2 proper motion survey : Constraints on the halo white dwarfs

Author: Goldman, B., Afonso, C., Alard, C., N Albert, J., Amadon, A., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., P Beaulieu, J., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouque, P., F Glicenstein, J., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., C Hamilton, J., Hardin, D., Kat, J., Kim, A., Lasserre, T., Le Guillou, L., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Jean-Baptiste Marquette, Maurice, E., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), EROS, Departement de recherche SPAtiale (DESPA), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Fouqué, Pascal, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Kerec, Hélène
Subjects: Physics, Proper motion, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Dark matter, FOS: Physical sciences, White dwarf, Astronomy and Astrophysics, Astrophysics, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], 01 natural sciences, Hydrogen atmosphere, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Halo, 10. No inequality, Effective volume, 010303 astronomy & astrophysics
Abstract: We are conducting a 377-square-degree proper motion survey in the ~V and I bands in order to determine the cool white dwarf contribution to the Galactic dark matter. Using the 250 square degrees for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we find no candidates in a 5500 pc^3 effective volume for old, fast M_V=17 white dwarfs. We check the detection efficiency by cross-matching our catalogue with Luyten's NLTT catalogue. The halo white dwarf contribution cannot exceed 5% (95% C.L.) for objects with M_V=17 and 1, Comment: 5 pages, 2 postscript figures, accepted for publication in A&A. Requires aa,epsfig,slashbox,natbib
Published: 2002

22. Photometric constraints on microlens spectroscopy of EROS-BLG-2000-5

Author: Alfonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É, Bareyre, P., Bauer, F., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamilton, J. C., Hardin, D., Kat, J., Kim, A., Lasserre, T., Leguillou, L., Lesquoy, É, Loup, C., Magneville, C., Mansoux, B., Marquette, J. B., Maurice, É, Milsztajn, A., Moniez, M., Nathalie Palanque-Delabrouille, Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Departement de recherche SPAtiale (DESPA), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), EROS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Fouqué, Pascal
Subjects: Physics, Microlens, Photosphere, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Radius, Atmospheric model, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], 01 natural sciences, Spectral line, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 13. Climate action, Space and Planetary Science, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Absorption (electromagnetic radiation), Spectroscopy, 010303 astronomy & astrophysics, Chromosphere
Abstract: We apply EROS photometric data to interpret previously published Keck and VLT spectra of the binary-microlens caustic-crossing event EROS-BLG-2000-5. We show that the VLT data imply that the outer 4 % of the limb of the K3-giant source is strongly in emission in Halpha, in contradiction to available models of the photosphere. This conflict could be resolved if the integrated Halpha emission from the chromosphere were equal to 8 % of the integrated Halpha absorption from the source as a whole. These conclusions regarding the extreme limb are almost completely model-independent. We also present a general method for using the photometric data to facilitate direct comparison between the atmospheric model and the spectroscopic data. While this method has some model-dependent features, it is fairly robust and can serve to guide the analysis of spectra while more detailed models of the lens geometry are being developed. In addition, we find that the color of the limb of the source (outer 5.5 % by radius) is Delta(V-I) = 0.37 redder than the source as a whole, so that it has the color of a M0 giant., Comment: 7 figures, 1 table
Published: 2001

23. Not enough stellar Mass Machos in the Galactic Halo

Author: Lasserre, T., Afonso, C., J-N, Albert, Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., J-P, Beaulieu, Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., J-F, Glicenstein, Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., J-C, Hamilton, Hardin, D., Kat, J., Kim, A., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Jean-Baptiste Marquette, Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Renault, C., Rich, J., Spiro, M., Vidal-Madjar, A., Vigrou, L., Zylberajch, S., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Physique Corpusculaire et Cosmologie - Collège de France (PCC), and Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract: We combine new results from the search for microlensing towards the Large Magellanic Cloud (LMC) by EROS2 (Experience de Recherche d'Objets Sombres) with limits previously reported by EROS1 and EROS2 towards both Magellanic Clouds. The derived upper limit on the abundance of stellar mass MACHOs rules out such objects as an important component of the Galactic halo if their mass is smaller than 1 solar mass., 4 pages, 2 figures, Accepted by A&A Letters Feb 23, 2000 (minor modifications in section 6)
Published: 2000

24. Observation of Microlensing towards the Galactic Spiral Arms. EROS II 3 year survey

Author: Derue, F., Afonso, C., Alard, C., J-N, Albert, Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., J-P, Beaulieu, Bouquet, A., Char, S., Charlot, X., François Couchot, Coutures, C., Ferlet, R., J-F, Glicenstein, Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., J-C, Hamilton, Hardin, D., Kat, J., Kim, A., Lasserre, L., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., J-B, Marquette, Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigrou, L., Zylberajch, S., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and EROS
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: We present an analysis of the light curves of 9.1 million stars observed during three seasons by EROS (Experience de Recherche d'Objets Sombres), in the Galactic plane away from the bulge. Seven stars exhibit luminosity variations compatible with gravitational microlensing effects due to unseen objects. The corresponding optical depth, averaged over four directions, is tau = 0.45 +0.24 -0.11 x 10^-6. While this value is compatible with expectations from simple galactic models under reasonable assumptions on the target distances, we find an excess of events with short timescale towards the direction closest to the Galactic Centre., Comment: 4 pages, 3 figures, submitted for publication in A&A Letters
Published: 2000
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25. Observation of Microlensing towards the Galactic Spiral Arms: EROS II 3 year survey

Author: Derue, F, Afonso, C, Alard, C, Albert, J N, Andersen, J, Ansari, R, Aubourg, E, Bareyre, P, Bauer, F, Beaulieu, J P, Blanc, G, Bouquet, A, Char, S, Charlot, X, Couchot, F, Coutures, C, Ferlet, R, Fouqué, P, Glicenstein, J F, Goldman, B, Gould, A, Graff, D, Gros, M H, Haïssinski, J, Hamilton, J C, Hardin, D, De Kat, J, Kim, A, Lasserre, T, Le Guillou, Laurent, Lesquoy, E, Loup, C, Magneville, C, Mansoux, B, Marquette, J B, Maurice, E, Milsztajn, A, Moniez, M, Palanque-Delabrouille, Nathalie, Perdereau, O, Prévot, L, Regnault, N, Rich, J, Spiro, Michel, Vidal-Madjar, A, Vigroux, L, and Zylberajch, S
Subjects: Astrophysics and Astronomy
Published: 2000

26. Measuring the thickness of the Magellanic Cloud Cepheid population: Implications for Microlensing

Author: Graff, D., Bauer, F., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Jp. Beaulieu, Bouquet, A., Char, S., Charlot, X., François Couchot, Coutures, C., Derue, F., Ferlet, R., Gaucherel, C., Glicenstein, J. F., Goldman, B., Gould, A., Gros, M., Haissinski, J., Hamilton, J. C., Hardin, D., Kat, J., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Jb. Marquette, Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Renault, C., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Lantz, Simone
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], e-document, digital document, Document
Abstract: This paper presents group discussions taking place within multidisciplinary topical network 33 of the CNRS Information and Communication Science and Technology (STIC) Department. It attempts to clarify the concept of document in its transtion to electronic form, based on research which tends to privilege form (as a material or immaterial object), sign (as meaningful object) or medium (as communication vector). Each of these terms reflects the radical transformations that are taking place. Their superposition stresses the importance of multidisciplinarity for a lucid and complete analysis of the concept and how it is changing.
Published: 1999

27. EROS 2 proper motion survey: a field brown dwarf and an L dwarf companion to LHS 102

Author: Goldman, B., Delfosse, X., Forveille, T., Afonso, C., Alard, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Beaulieu, J. P., Borsenberger, J., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouqué, P., Glicenstein, J. F., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamilton, J. C., Hardin, D., Kat, J., Kim, A., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Jean-Baptiste Marquette, Martin, E. L., Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., The Eros Collaboration, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Observatoire de Paris - Site de Meudon (OBSPM), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EROS, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Lantz, Simone
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract: We report the discovery of two L dwarfs (the new spectral class defined for dwarfs cooler than the M type) in a two-epoch CCD proper motion survey of 413 square degrees, complemented by infrared photometry from DENIS. One of them has a strong lithium line and is therefore a brown dwarf. The other is a common proper motion companion to the mid-M dwarf LHS 102 (GJ 1001), which has a well determined trigonometric parallax. LHS 102B is thus the coolest L dwarf of known distance and luminosity. Its infrared absolute photometry are very well reproduced by the Allard et al DUSTY models., Comment: 5 pages, LaTeX, 6 postscript figures, style correction, two spectra of the discovered objects added, coordinates of the LHS102 pair corrected
Published: 1999

28. New Magellanic Cloud R Coronae Borealis and DY Persei type stars from the EROS-2 database: The connection between RCBs, DYPers, and ordinary carbon stars

Author: Tisserand, Patrick, Wood, Peter R, Marquette, J B, Afonso, C, Albert, J.N., Anderson, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Charlot, X, Coutures, C, Ferlet, R, Tisserand, Patrick, Wood, Peter R, Marquette, J B, Afonso, C, Albert, J.N., Anderson, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Charlot, X, Coutures, C, and Ferlet, R
Abstract: Context. R Coronae Borealis stars (RCB) are a rare type of evolved carbon-rich supergiant stars that are increasingly thought to result from the merger of two white dwarfs, called the Double degenerate scenario. This scenario is also studied as a source
Published: 2009

29. Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud

Author: Marquette, J.B., Tisserand, P., Francois, P., Beaulieu, J.P., Doublier, V., Lesquoy, É., Milsztajn, A., Pritchard, J., Schwarzenberg-Czerny, A., Alfonso, C., Albert, J.N., Andersen, Johannes, Ansari, R., Aubourg, É., Bareyre, P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J.F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamadache, C., de Kat, J., Le Guillou, L., Loup, C., Magneville, C., Maurice, É., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y.R., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Marquette, J.B., Tisserand, P., Francois, P., Beaulieu, J.P., Doublier, V., Lesquoy, É., Milsztajn, A., Pritchard, J., Schwarzenberg-Czerny, A., Alfonso, C., Albert, J.N., Andersen, Johannes, Ansari, R., Aubourg, É., Bareyre, P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J.F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamadache, C., de Kat, J., Le Guillou, L., Loup, C., Magneville, C., Maurice, É., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y.R., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Abstract: Udgivelsesdato: August
Published: 2008

30. EROS 2 intensive observation of the caustic crossing of microlensing event MACHO SMC-98-1

Author: Bauer, F., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Jp. Beaulieu, Bouquet, A., Char, S., Charlot, X., François Couchot, Coutures, C., Derue, F., Ferlet, R., Kim, A., Gaucherel, C., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D. S., Gros, M., Haissinski, J., Hamilton, J. C., Hardin, D., Lasserre, T., Lesquoy, E., Loup, C., Kat, J., Magneville, C., Mansoux, B., Jb. Marquette, Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Renault, C., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EROS, and Lantz, Simone
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract: We report on intensive photometric monitoring on 18 June 1998 of MACHO SMC-98-1, a binary-lens microlensing event seen toward the Small Magellanic Cloud (SMC). The observations cover 5.3 hours (UT 5:17 -- 10:37), and show a sharp drop of 1.8 mag during the first 1.8 hours, followed by an abrupt flattening at UT 7:08 +- 0:02. We interpret the kink at 7:08 as the end of the second caustic crossing (when the source first moved completely outside the caustic). These results indicate that mu sin(phi), Comment: 4 pages, 4 ps figures. Submitted to Astronomy & Astrophysics. Halo interpretation excluded at the 93% CL (instead of 89%)
Published: 1998
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31. Microlensing towards the Small Magellanic Cloud - EROS 2 first year survey

Author: Palanque-Delabrouille, N., Afonso, C., J-N, Albert, Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., J-P, Beaulieu, Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., J-F, Glicenstein, Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., J-C, Hamilton, Hardin, D., Kat, J., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Jean-Baptiste Marquette, Maurice, E., Milsztajn, A., Moniez, M., Perdereau, O., Prevot, L., Renault, C., Rich, J., Spiro, M., Vidal-Madjar, A., Vigrou, L., Zylberajch, S., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and EROS
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract: We present here an analysis of the light curves of 5.3 million stars in the Small Magellanic Cloud observed by EROS (Exp\'erience de Recherche d'Objets Sombres). One star exhibits a variation that is best interpreted as due to gravitational microlensing by an unseen object. This candidate was also reported by the MACHO collaboration. Once corrected for blending, the Einstein radius crossing time is 123 days, corresponding to lensing by a Halo object of $2.6^{+8.2}_{-2.3} M_{\odot}$. The maximum magnification is a factor of 2.6. The light curve also displays a periodic modulation with a 2.5% amplitude and a period of 5.1 days. Parallax analysis of the candidate indicates that a Halo lens would need to have a mass of at least $0.3 M_{\odot}$, although a lens in the SMC could have a mass as low as $0.07 M_{\odot}}$. We estimate the optical depth for microlensing towards the SMC due to this event to be $\sim 3.3 \times 10^{-7}$, with an uncertainty dominated by Poisson statistics. We show that this optical depth corresponds to about half that expected for a spherical isothermal Galactic Halo comprised solely of such objects, and that it is consistent with SMC self-lensing if the SMC is elongated along the line-of-sight by at least 5 kpc., Comment: 10 pages, 11 figures (9 included .eps and 2 separate .gif). Numerical value for constrain on mass and distance of deflector from parallax analysis less severe than previously. Minor changes otherwise. Accepted for publication in Astronomy & Astrophysics
Published: 1998

32. Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic clouds

Author: Tisserand, Patrick, Le Guillou, L, Afonso, C, Albert, J N, Anderson, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Charlot, X, Coutures, C, Ferlet, R, Fouque, P, Glicenstein, J F, Goldman, B, Gould, A, Graff, D., Gros, M, Haissinski, J, Hamadache, C., de Kat, J, Lasserre, T, Lesquoy, E, Loup, C, Magneville, C, Marquette, J B, Maurice, E, Maury, A., Milsztajn, A, Moniez, M, Palanque-Delabrouille, N, Perdereau, O, Rahal, Y R, Rich, J, Spiro, M, Vidal-Madjar, A, Vigroux, L, Zylberajch, S, Tisserand, Patrick, Le Guillou, L, Afonso, C, Albert, J N, Anderson, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Charlot, X, Coutures, C, Ferlet, R, Fouque, P, Glicenstein, J F, Goldman, B, Gould, A, Graff, D., Gros, M, Haissinski, J, Hamadache, C., de Kat, J, Lasserre, T, Lesquoy, E, Loup, C, Magneville, C, Marquette, J B, Maurice, E, Maury, A., Milsztajn, A, Moniez, M, Palanque-Delabrouille, N, Perdereau, O, Rahal, Y R, Rich, J, Spiro, M, Vidal-Madjar, A, Vigroux, L, and Zylberajch, S
Abstract: Aims. The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called "machos") could be a major component of the dark matter halo of the Milky Way galaxy. To this end, EROS-2 monitored over 6.7 years 33 × 106 star
Published: 2007

33. Unusual behaviour of fusion-fission at barrier energies for a neutron-rich halo nucleus

Author: Fekou-Youmbi, V., Sida, J-L., Alamanos, N., Mittig, W., Auger, F., Bazin, Dominique, Borcea, C., Cabot, C., Charlot, X., Cunsolo, A., Foti, A., Gillibert, A., Lecesne, N., Lepine, A., Lewitowicz, M., Liguori-Neto, R., Marie, F., Mazur, C., Mougeot, A., Ottini, S., Pollacco, E., Ostrowski, A., Riallot, M., Roussel-Chomaz, P., Volant, C., Feng, Y.Y., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Robert, Suzanne, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published: 1997

34. EROS 2 photometry of probable R coronae borealis stars in the small magellanic cloud

Author: Tisserand, P., Marquette, J.B., Beaulieu, J.P., de Laverny, P., Lesquoy, E., Milsztajn, A., Afonso, C., Albert, J.N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Blanc, G., Charlot, X., Coutures, C., Derue, F., Ferlet, R., Fouque, P., Glicenstein, J.F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lasserre, T., Le Guillou, L., Loup, C., Magneville, C., Mansoux, B., Maurice, E., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Rahal, Y., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Tisserand, P., Marquette, J.B., Beaulieu, J.P., de Laverny, P., Lesquoy, E., Milsztajn, A., Afonso, C., Albert, J.N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Blanc, G., Charlot, X., Coutures, C., Derue, F., Ferlet, R., Fouque, P., Glicenstein, J.F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lasserre, T., Le Guillou, L., Loup, C., Magneville, C., Mansoux, B., Maurice, E., Maury, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Rahal, Y., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Abstract: Astronomy
Published: 2004

35. Limits on Galactic dark matter with 5 years of EROS SMC data

Author: Afonso, C, Albert, J N, Andersen, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Blanc, G., Charlot, X, Couchot, F, Coutures, C, Tisserand, Patrick, Afonso, C, Albert, J N, Andersen, J, Ansari, R, Aubourg, E, Bareyre, P, Beaulieu, J.-P, Blanc, G., Charlot, X, Couchot, F, Coutures, C, and Tisserand, Patrick
Abstract: Five years of EROS data towards the Small Magellanic Cloud have been searched for gravitational microlensing events, using a new, more accurate method to assess the impact of stellar blending on the efficiency. Four long-duration candidates have been found which, if they are microlensing events, hint at a non-halo population of lenses. Combined with results from other EROS observation programs, this analysis yields strong limits on the amount of Galactic dark matter made of compact objects. Less than 25% of a standard halo can be composed of objects with a mass between 2 × 10-7 M⊙ and 1 M⊙ at the 95% C.L.
Published: 2003

36. New Magellanic Cloud R Coronae Borealis and DY Persei type stars from the EROS-2 database: the connection between RCBs, DYPers, and ordinary carbon stars

Author: Tisserand, P., primary, Wood, P. R., additional, Marquette, J. B., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Beaulieu, J. P., additional, Charlot, X., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Gros, M., additional, de Kat, J., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Maurice, É., additional, Maury, A., additional, Milsztajn, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Rich, J., additional, Schwemling, P., additional, Spiro, M., additional, and Vidal-Madjar, A., additional
Published: 2009
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37. The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database

Author: Marquette, J. B., primary, Beaulieu, J. P., additional, Buchler, J. R., additional, Szabó, R., additional, Tisserand, P., additional, Belghith, S., additional, Fouqué, P., additional, Lesquoy, É., additional, Milsztajn, A., additional, Schwarzenberg-Czerny, A., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Charlot, X., additional, Coutures, C., additional, Ferlet, R., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haïssinski, J., additional, Hamadache, C., additional, de Kat, J., additional, Le Guillou, L., additional, Loup, C., additional, Magneville, C., additional, Maurice, É., additional, Maury, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Rahal, Y. R., additional, Rich, J., additional, Spiro, M., additional, and Vidal-Madjar, A., additional
Published: 2009
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38. Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud

Author: Marquette, J. B., primary, Tisserand, P., additional, François, P., additional, Beaulieu, J. P., additional, Doublier, V., additional, Lesquoy, É., additional, Milsztajn, A., additional, Pritchard, J., additional, Schwarzenberg-Czerny, A., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Charlot, X., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, Hamadache, C., additional, de Kat, J., additional, Le Guillou, L., additional, Loup, C., additional, Magneville, C., additional, Maurice, É., additional, Maury, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Rahal, Y. R., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, and Zylberajch, S., additional
Published: 2008
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39. R Coronae Borealis stars in the Galactic bulge discovered by EROS-2

Author: Tisserand, P., primary, Marquette, J. B., additional, Wood, P. R., additional, Lesquoy, É., additional, Beaulieu, J. P., additional, Milsztajn, A., additional, Hamadache, C., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Charlot, X., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Gros, M., additional, Haissinski, J., additional, de Kat, J., additional, Le Guillou, L., additional, Loup, C., additional, Magneville, C., additional, Maurice, É., additional, Maury, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Rahal, Y., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, and Zylberajch, S., additional
Published: 2008
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40. Combined Analysis of the Binary Lens Caustic-crossing Event MACHO 98-SMC-1

Author: Afonso, J., Alard, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Beaulieu, J.-P., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamilton, Jane C., Hardin, D., de Kat, J., Kim, Alex G., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Marquette, J. B., Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Alcock, Charles, Allsman, Robyn, Alves, David R., Axelrod, Tim, Becker, Andrew C., Cook, Kem H., Drake, Andrew John, Freeman, Kenneth, Griest, K., King, Lynette J., Lehner, M. J., Marshall, S. L., Minniti, Dante, Peterson, Bruce, Pratt, M., Quinn, Peter J., Rodgers, Alexander, Stetson, Peter B., Stubbs, Christopher W., Sutherland, William J., Tomaney, A. B., Vandehei, T., Rhie, S., Bennett, D. P., Fragile, P. C., Johnson, B. Ronald, Quinn, Jason L., Udalski, A., Kubiak, M., Szymanski, M., Pietrzysnki, G., Wozniak, P., Zebrun, K., Albrow, M., Caldwell, J. A. R., DePoy, D., Dominik, M., Gaudi, B. S., Greenhill, J, Hill, Kym, Kane, S., Martin, R., Menzies, J., Naber, R. M., Pogge, R. W., Pollard, K. R., Sackett, Penny D., Sahu, K. C., Vermaak, P., Watson, R., Williams, Andrew, Afonso, J., Alard, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, E., Bareyre, P., Bauer, F., Beaulieu, J.-P., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamilton, Jane C., Hardin, D., de Kat, J., Kim, Alex G., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Marquette, J. B., Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Alcock, Charles, Allsman, Robyn, Alves, David R., Axelrod, Tim, Becker, Andrew C., Cook, Kem H., Drake, Andrew John, Freeman, Kenneth, Griest, K., King, Lynette J., Lehner, M. J., Marshall, S. L., Minniti, Dante, Peterson, Bruce, Pratt, M., Quinn, Peter J., Rodgers, Alexander, Stetson, Peter B., Stubbs, Christopher W., Sutherland, William J., Tomaney, A. B., Vandehei, T., Rhie, S., Bennett, D. P., Fragile, P. C., Johnson, B. Ronald, Quinn, Jason L., Udalski, A., Kubiak, M., Szymanski, M., Pietrzysnki, G., Wozniak, P., Zebrun, K., Albrow, M., Caldwell, J. A. R., DePoy, D., Dominik, M., Gaudi, B. S., Greenhill, J, Hill, Kym, Kane, S., Martin, R., Menzies, J., Naber, R. M., Pogge, R. W., Pollard, K. R., Sackett, Penny D., Sahu, K. C., Vermaak, P., Watson, R., and Williams, Andrew
Published: 2000

41. Galactic Bulge microlensing optical depth from EROS-2

Author: Hamadache, C., primary, Le Guillou, L., additional, Tisserand, P., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Beaulieu, J. P., additional, Charlot, X., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, de Kat, J., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Marquette, J. B., additional, Maurice, É., additional, Maury, A., additional, Milsztajn, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Rahal, Y. R., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2006
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42. EROS 2 photometry of probable R Coronae Borealis stars in the Small Magellanic Cloud

Author: Tisserand, P., primary, Marquette, J. B., additional, Beaulieu, J. P., additional, de Laverny, P., additional, Lesquoy, É., additional, Milsztajn, A., additional, Afonso, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Bauer, F., additional, Blanc, G., additional, Charlot, X., additional, Coutures, C., additional, Derue, F., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, Hamadache, C., additional, de Kat, J., additional, Lasserre, T., additional, Le Guillou, L., additional, Loup, C., additional, Magneville, C., additional, Mansoux, B., additional, Maurice, É., additional, Maury, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Prévot, L., additional, Rahal, Y., additional, Regnault, N., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2004
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43. Type Ia supernova rate at a redshift of ~0.1

Author: Blanc, G., primary, Afonso, C., additional, Alard, C., additional, Albert, J. N., additional, Aldering, G., additional, Amadon, A., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Balland, C., additional, Bareyre, P., additional, Beaulieu, J. P., additional, Charlot, X., additional, Conley, A., additional, Coutures, C., additional, Dahlén, T., additional, Derue, F., additional, Fan, X., additional, Ferlet, R., additional, Folatelli, G., additional, Fouqué, P., additional, Garavini, G., additional, Glicenstein, J. F., additional, Goldman, B., additional, Goobar, A., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, Hamadache, C., additional, Hardin, D., additional, Hook, I. M., additional, de Kat, J., additional, Kent, S., additional, Kim, A., additional, Lasserre, T., additional, Le Guillou, L., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Marquette, J. B., additional, Maurice, É., additional, Maury, A., additional, Milsztajn, A., additional, Moniez, M., additional, Mouchet, M., additional, Newberg, H., additional, Nobili, S., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Prévot, L., additional, Rahal, Y. R., additional, Regnault, N., additional, Rich, J., additional, Ruiz-Lapuente, P., additional, Spiro, M., additional, Tisserand, P., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, Walton, N. A., additional, and Zylberajch, S., additional
Published: 2004
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44. Limits on Galactic dark matter with 5 years of EROS SMC data

Author: Afonso, C., primary, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Beaulieu, J. P., additional, Blanc, G., additional, Charlot, X., additional, Couchot, F., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, Hamadache, C., additional, de Kat, J., additional, Lasserre, T., additional, Le Guillou, L., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Marquette, J. B., additional, Maurice, É., additional, Maury, A., additional, Milsztajn, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Prévot, L., additional, Rahal, Y. R., additional, Rich, J., additional, Spiro, M., additional, Tisserand, P., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2003
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45. Limits on the Macho content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds ***

Author: Tisserand, P., Le Guillou, L., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Beaulieu, J. P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lasserre, T., Lesquoy, É., Loup, C., Magneville, C., Marquette, J. B., Maurice, É., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Tisserand, P., Le Guillou, L., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Beaulieu, J. P., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., Lasserre, T., Lesquoy, É., Loup, C., Magneville, C., Marquette, J. B., Maurice, É., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Rahal, Y. R., Rich, J., Spiro, M., Vidal-Madjar, A., and Vigroux, L.
Abstract: Aims.The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called “machos”) could be a major component of the dark matter halo of the Milky Way galaxy. To this end, EROS-2 monitored over 6.7 years $33\times10^6$stars in the Magellanic clouds for microlensing events caused by such objects.
Published: 2007
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46. The OGLE-II event sc5_2859: a classical nova outburst?

Author: Afonso, C., Glicenstein, J. F., Gould, A., Smith, M. C., Wagner, R. M., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Beaulieu, J. P., Blanc, G., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Goldman, B., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., LeGuillou, L., Lesquoy, É., Loup, C., Magneville, C., Marquette, J. B., Maurice, É., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Rahal, Y. R., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Afonso, C., Glicenstein, J. F., Gould, A., Smith, M. C., Wagner, R. M., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Beaulieu, J. P., Blanc, G., Charlot, X., Coutures, C., Ferlet, R., Fouqué, P., Goldman, B., Graff, D., Gros, M., Haissinski, J., Hamadache, C., de Kat, J., LeGuillou, L., Lesquoy, É., Loup, C., Magneville, C., Marquette, J. B., Maurice, É., Maury, A., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Rahal, Y. R., Rich, J., Spiro, M., Tisserand, P., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Abstract: Context.The OGLE-II event sc5_2859 was previously identified as the third longest microlensing event ever observed.Aims.Additional photometric observations from the EROS (Expérience de Recherche d'Objets Sombres) survey and spectroscopic observations of the candidate star are used to test the microlensing hypothesis.Methods.The combined OGLE and EROS data provide a high quality coverage of the light curve. The colour of the sc5_2859 event is seen to change with time. A spectrum taken in 2003 exhibits a strong Hαemission line.Results.The additionnal data show that the OGLE-II sc5_2859 event is actually a classical nova outburst.
Published: 2006
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47. Blue irregular variable stars in the Small Magellanic Cloud from EROS2: Herbig Ae/Be or classical Be stars?

Author: Beaulieu, J.-P., primary, de Wit, W. J., additional, Lamers, H. J. G. L. M., additional, Marquette, J.-B., additional, Coutures, C., additional, Leisy, P., additional, Totor, S., additional, Palanque-Delabrouille, N., additional, Afonso, C., additional, Alard, C., additional, Albert, J. N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Bauer, F., additional, Blanc, G., additional, Charlot, X., additional, Couchot, F., additional, Derue, F., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J. F., additional, Goldman, B., additional, Graff, D., additional, Gros, M., additional, Haissinski, J., additional, Hamilton, J. C., additional, Hardin, D., additional, de Kat, J., additional, Lasserre, T., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Mansoux, B., additional, Maurice, É., additional, Milsztajn, A., additional, Moniez, M., additional, Perdereau, O., additional, Prévot, L., additional, Regnault, N., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2001
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48. Observation of microlensing toward the galactic spiral arms. EROS II 3 year survey

Author: Derue, F., primary, Afonso, C., additional, Alard, C., additional, Albert, J.-N., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Bauer, F., additional, Beaulieu, J.-P., additional, Blanc, G., additional, Bouquet, A., additional, Char, S., additional, Charlot, X., additional, Couchot, F., additional, Coutures, C., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J.-F., additional, Goldman, B., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haïssinski, J., additional, Hamilton, J.-C., additional, Hardin, D., additional, de Kat, J., additional, Kim, A., additional, Lasserre, T., additional, Le Guillou, L., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, C., additional, Mansoux, B., additional, Marquette, J.-B., additional, Maurice, É., additional, Milsztajn, A., additional, Moniez, M., additional, Palanque-Delabrouille, N., additional, Perdereau, O., additional, Prévot, L., additional, Regnault, N., additional, Rich, J., additional, Spiro, M., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2001
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49. Observation of periodic variable stars towards the Galactic spiral arms by EROS II ******

Author: Derue, F., Marquette, J.-B., Lupone, S., Afonso, C., Alard, C., Albert, J.-N., Amadon, A., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Bauer, F., Beaulieu, J.-P., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J.-F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamilton, J.-C., Hardin, D., de Kat, J., Kim, A., Lasserre, T., Le Guillou, L., Lesquoy, É., Loup, C., Magneville, C., Mansoux, B., Maurice, É., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Derue, F., Marquette, J.-B., Lupone, S., Afonso, C., Alard, C., Albert, J.-N., Amadon, A., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Bauer, F., Beaulieu, J.-P., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Ferlet, R., Fouqué, P., Glicenstein, J.-F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamilton, J.-C., Hardin, D., de Kat, J., Kim, A., Lasserre, T., Le Guillou, L., Lesquoy, É., Loup, C., Magneville, C., Mansoux, B., Maurice, É., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., and Zylberajch, S.
Abstract: We present the results of a massive variability search based on a photometric survey of a six square degree region along the Galactic plane at ($l = 305^\circ$, $b = -0.8^\circ$) and ($l = 330^\circ$, $b = -2.5^\circ$). This survey was performed in the framework of the EROS II(Expérience de Recherche d'Objets Sombres) microlensing program. The variable stars were found among 1 913 576 stars that were monitored between April and June 1998 in two passbands, with an average of 60 measurements. A new period-search technique is proposed which makes use of a statistical variable that characterizes the overall regularity of the flux versus phase diagram. This method is well suited when the photometric data are unevenly distributed in time, as is our case. 1362 objects whose luminosity varies were selected. Among them we identified 9 Cepheids, 19 RR Lyræ, 34 Miras, 176 eclipsing binaries and 266 Semi-Regular stars. Most of them are newly identified objects. The cross-identification with known catalogues has been performed. The mean distance of the RR Lyræ is estimated to be ~$ 4.9 \pm 0.3$kpc undergoing an average absorption of ~$ 3.4 \pm 0.2$mag. This distance is in good agreement with that of disc stars that contribute to the microlensing source star population. Our catalogue and light curves are available electronically from the CDS, Strasbourg and from our Web site.
Published: 2002
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50. Photometric constraints on microlens spectroscopy of EROS-BLG-2000-5

Author: Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Bauer, F., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamilton, J. C., Hardin, D., de Kat, J., Kim, A., Lasserre, T., LeGuillou, L., Lesquoy, É., Loup, C., Magneville, C., Mansoux, B., Marquette, J. B., Maurice, É., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Afonso, C., Albert, J. N., Andersen, J., Ansari, R., Aubourg, É., Bareyre, P., Bauer, F., Blanc, G., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouqué, P., Glicenstein, J. F., Goldman, B., Gould, A., Graff, D., Gros, M., Haïssinski, J., Hamilton, J. C., Hardin, D., de Kat, J., Kim, A., Lasserre, T., LeGuillou, L., Lesquoy, É., Loup, C., Magneville, C., Mansoux, B., Marquette, J. B., Maurice, É., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prévot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., and Vigroux, L.
Abstract: We apply EROS photometric data to interpret previously published Keck and VLT spectra of the binary-microlens caustic-crossing event EROS-BLG-2000-5. We show that the VLT data imply that the outer ${\sim} 4\%$of the limb of the K3-giant source is strongly in emission in Hα, in contradiction to available models of the photosphere. This conflict could be resolved if the integrated Hαemission from the chromosphere were equal to 8% of the integrated Hαabsorption from the source as a whole. These conclusions regarding the extreme limb are almost completely model-independent. We also present a general method for using the photometric data to facilitate direct comparison between the atmospheric model and the spectroscopic data. While this method has some model-dependent features, it is fairly robust and can serve to guide the analysis of spectra while more detailed models of the lens geometry are being developed. In addition, we find that the color of the limb of the source (outer 5.5% by radius) is $\Delta(V-I)\sim 0.37$redder than the source as a whole, so that it has the color of a M0 giant.
Published: 2001
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