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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 $z \sim 0.1$

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

9. EROS Variable Stars : Discovery of Beat Cepheids in the Small Magellanic Cloud and the effect of metallicity on pulsation

Author: Beaulieu, J. P., Krockenberger, M., Sasselov, D. D., Renault, C., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prévot, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., de Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., and Gry., C.
Subjects: Astrophysics
Abstract: We report the discovery of eleven beat Cepheids in the Small Magellanic Cloud, using data obtained by the EROS microlensing survey. Four stars are beating in the fundamental and first overtone mode (F/1OT), seven are beating in the first and second overtone (1OT/2OT). The SMC F/1OT ratio is systematically higher than the LMC F/1OT, while the 1OT/2OT period ratio in the SMC Cepheids is the same as the LMC one., Comment: 4 pages, Latex file with 4 .ps figures. accepted for publication in A A Letters
Published: 1997

10. The effect of metallicity on the Cepheid distance scale and its implications for the Hubble constant ($H_0$) determination

Author: Beaulieu, J. P., Sasselov, D. D., Renault, C., Grison, P., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prévot, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., de Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Gry, C., Guibert, J., Moreau, O., and Tajhmady, F.
Subjects: Astrophysics
Abstract: Recent HST determinations of the expansion's rate of the Universe (the Hubble constant, H_0) assumed that the Cepheid Period-Luminosity relation at V and I are independent of metallicity (Freedman, et al., 1996, Saha et al., 1996, Tanvir et al., 1995). The three groups obtain different vales for H_0. We note that most of this discrepancy stems from the asumption (by both groups) that the Period-Luminosity relation is independent of metallicity. We come to this conclusion as a result of our study of the Period-Luminosity relation of 481 Cepheids with 3 millions two colour measurements in the Large Magellanic Cloud and the Small Magellanic Cloud obtained as a by-product of the EROS microlensing survey. We find that the derived interstellar absorption corrections are particularly sensitive to the metallicity and when our result is applied to recent estimates based on HST Cepheids observations it makes the low-H_0 values higher and the high-H_0 value lower, bringing those discrepant estimates into agrement around $H_0 \approx 70 km/s Mpc^{-1}$., Comment: 4 pages, Latex, with 2 .ps accepted for publication astronomy and astrophysics Letters
Published: 1996

11. Metallicity Effects on the Cepheid Extragalactic Distance Scale from EROS photometry in LMC and SMC

Author: Sasselov, D. D., Beaulieu, J. P., Renault, C., Grison, P., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prévot, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., de Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Gry, C., Guibert, J., Moreau, O., and Tajhmady, F.
Subjects: Astrophysics
Abstract: This is an investigation of the period-luminosity relation of classical Cepheids in samples of different metallicity. It is based on 481 Cepheids in the Large and Small Magellanic Clouds from the blue and red filter CCD observations (most similar to V_J & R_J) of the French EROS microlensing project. The data-set is complete and provides an excellent basis for a differential analysis between LMC and SMC. In comparison to previous studies of effects on the PL-relation, the EROS data-set offers extremely well-sampled light curves and well-filled instability strips. This allows reliable separation of Cepheids pulsating in the fundamental and the first overtone mode and derivation of differential reddening. Our main result concerns the determination of distances to galaxies which are inferred by using the LMC as a base and using two color photometry to establish the amount of reddening. We find a zero-point offset between SMC and LMC which amounts to a difference between inferred and true distance modulus of 0.14 \pm 0.06 mag in the VI_c system. The offset is exactly the same in both sets of PL-relations - of the fundamental and of the first overtone mode Cepheids. No effect is seen on the slopes of the PL-relations, although the fundamental and the first overtone mode Cepheids have different PL slopes. We attribute the color and the zero-point offset to the difference in metallicity between the SMC and LMC Cepheids. A metallicity effect of that small magnitude still has important consequencies for the inferred Cepheid distances and the determination of H_0. When applied to recent estimates based on HST Cepheid observations, our metallicity dependence makes the low-H_0 values (Sandage et al. 1994) higher and the high-H_0 values (Freedman et al. 1994b) lower, thus bringing those, Comment: 14 pages, Latex, with 8 .ps accepted for publication in astronomy and astrophysics
Published: 1996

12. Observational Limits on Machos in the Galactic Halo

Author: EROS collaboration, Renault, C., Afonso, C., Aubourg, E., Bareyre, P., Bauer, F., Brehin, S., Coutures, C., Gaucherel, C., Glicenstein, J. F., Goldman, B., Gros, M., Hardin, D., de Kat, J., Lachieze-Rey, M., Laurent, B., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Palanque-Delabrouille, N., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Couchot, F., Mansoux, B., Moniez, M., Perdereau, O., Beaulieu, J. -Ph., Ferlet, R., Grison, Ph., Vidal-Madjar, A., Guibert, J., Moreau, O., Maurice, E., Prevot, L., Gry, C., Char, S., and Fernandez, J.
Subjects: Astrophysics
Abstract: We present final results from the first phase of the EROS search for gravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo Objects). The search is sensitive to events with time scales between 15 minutes and 200 days corresponding to deflector masses in the range 1.e-7 to a few solar masses. Two events were observed that are compatible with microlensing by objects of mass of about 0.1 Mo. By comparing the results with the expected number of events for various models of the Galaxy, we conclude that machos in the mass range [1.e-7, 0.02] Mo make up less than 20% (95% C.L.) of the Halo dark matter., Comment: 4 pages, 3 Postscript figures, to be published in Astronomy & Astrophysics
Published: 1996

13. Pre-Main-Sequence Star Candidates in the Bar of the Large Magellanic Cloud

Author: Beaulieu, J. P., Grison, P., Julien, R., Lanciaux, C., Ferlet, R., Vidal-Madjar, A., Bertin, E., Maurice, E., Prévot, L., Gry, C., Guibert, J., Moreau, O., Tajhmady, F., Aubourg, E., Bareyre, P., de Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Renault, C., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., and Moniez, M.
Published: 1996

14. 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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15. 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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16. A 20 cm2 CCD mosaic camera for a dark matter search part I : Mechanics, optics and cryogeny

Author: Arnaud, M., Aubourg, E., Bareyre, P., Br';ehin, S., Caridroit, R., de Kat, J., Dispau, G., Djidi, K., Gros, M., Lachièze-Rey, M., Laigneau, Y., Laurent, B., Lesquoy, E., Lavocat, Ph., Magneville, C., Mazeau, B., Milsztajn, A., Moscoso, L., Pasquaud, J., Paul, B., Perrin, P., Petibon, J., Piret, Y., Queinnec, F., Rich, J., Spiro, M., de Trogoff, J., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Beaulieu, J. P., Ferlet, R., Grison, Ph., Vidal-Madjar, A., Adrianzyk, G., Berger, J. P., Burnage, R., Delclite, J. C., Kohler, D., Magnan, R., Richaud, A., Guibert, J., Moreau, O., Tajahmady, F., Baranne, A., Maurice, E., Prévôt, L., and Gry, C.
Published: 1994
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17. A 20cm 2 CCD mosaic camera for a dark matter search part II : Electronics, data acquisition and performance

Author: Arnaud, M., Aubourg, E., Bareyre, P., Br';ehin, S., Caridroit, R., de Kat, J., Dispau, G., Djidi, K., Gros, M., Lachièze-Rey, M., Laigneau, Y., Laurent, B., Lesquoy, E., Lavocat, Ph., Magneville, C., Mazeau, B., Milsztajn, A., Moscoso, L., Pasquaud, J., Paul, B., Perrin, P., Petibon, J., Piret, Y., Queinnec, F., Rich, J., Spiro, M., de Trogoff, J., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Beaulieu, J. P., Ferlet, R., Grison, Ph., Vidal-Madjar, A., Adrianzyk, G., Berger, J. P., Burnage, R., Delclite, J. C., Kohler, D., Magnan, R., Richaud, A., Guibert, J., Moreau, O., Tajahmady, F., Baranne, A., Maurice, E., Prévôt, L., and Gry, C.
Published: 1994
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18. 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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19. 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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20. Modeling of near field illumination of a body of revolution for RCS V/UHF measurements

Author: Pujols, A., primary, Collino, F., additional, Bonnemason, P., additional, and de Kat, J., additional
Published: 2019
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21. Comparison of the measured and computed RCS of a target: Criterion taking into account the measurement and computation uncertainties

Author: Bonnemason, P., primary, de Kat, J., additional, Etchessahar, B., additional, Massaloux, P., additional, Minvielle, P., additional, and Maze-Merceur, G., additional
Published: 2017
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22. 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

23. 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

24. 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

25. 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

26. 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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27. 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

28. AGAPEROS: Searches for microlensing in the LMC with the Pixel Method - 1, Data treatment and pixel light curves production

Author: Melchior, A L., Afonso, C., Ansari, R., Aubourg, E., Baillon, P., Bareyre, P., Bauer, F., Beaulieu, J.P., Bouquet, A., Brehin, S., Cavalier, F., Char, S., Couchot, F., Coutures, C., Ferlet, R., Fernandez, J., Gaucherel, C., Giraud-Heraud, Y., Glicenstein, J.F., Goldman, B., Gondolo, P., Gros, M., Guibert, J., Gry, C., Hardin, D., Kaplan, J., De Kat, J., Lachieze-Rey, M., Laurent, B., Lesquoy, E., Magneville, C., Mansoux, B., Marquette, J B., Maurice, E., Milsztajn, A., Moniez, M., Moreau, O., Moscoso, L., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Renault, C., Queinnec, F., 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), 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), 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), Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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, 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 Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics and Astronomy, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: The presence and abundance of MAssive Compact Halo Objects (MACHOs) towards the Large Magellanic Cloud (LMC) can be studied with microlensing searches. The 10 events detected by the EROS and MACHO groups suggest that objects with 0.5 Mo could fill 50% of the dark halo. This preferred mass is quite surprising, and increasing the presently small statistics is a crucial issue. Additional microlensing of stars too dim to be resolved in crowded fields should be detectable using the Pixel Method. We present here an application of this method to the EROS 91-92 data (one tenth of the whole existing data set). We emphasize the data treatment required for monitoring pixel fluxes. Geometric and photometric alignments are performed on each image. Seeing correction and error estimates are discussed. 3.6" x 3.6" super-pixel light curves, thus produced, are very stable over the 120 days time-span. Fluctuations at a level of 1.8% of the flux in blue and 1.3% in red are measured on the pixel light curves. This level of stability is comparable with previous estimates. The data analysis dedicated to the search of possible microlensing events together with refined simulations will be presented in a companion paper. Recent surveys monitoring millions of light curves of resolved stars in the LMC have discovered several microlensing events. Unresolved stars could however significantly contribute to the microlensing rate towards the LMC. Monitoring pixels, as opposed to individual stars, should be able to detect stellar variability as a variation of the pixel flux. We present a first application of this new type of analysis (Pixel Method) to the LMC Bar. We describe the complete procedure applied to the EROS 91-92 data (one tenth of the existing CCD data set) in order to monitor pixel fluxes. First, geometric and photometric alignments are applied to each images. Averaging the images of each night reduces significantly the noise level. Second, one light curve for each of the 2.1 10^6 pixels is built and pixels are lumped into 3.6"x3.6" super-pixels, one for each elementary pixel. An empirical correction is then applied to account for seeing variations. We find that the final super-pixel light curves fluctuate at a level of 1.8% of the flux in blue and 1.3% in red. We show that this noise level corresponds to about twice the expected photon noise and confirms previous assumptions used for the estimation of the contribution of unresolved stars. We also demonstrate our ability to correct very efficiently for seeing variations affecting each pixel flux. The technical results emphasised here show the efficacy of the Pixel Method and allow us to study luminosity variations due to possible microlensing events and variable stars in two companion papers.
Published: 1999

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 VARIABLE STARS: Discovery of beat Cepheids in the Small Magellanic Cloud and the effect of metallicity on pulsation

Author: de Laverny, P, Beaulieu, JP, Asplund, M, Kilkenny, D, Renault, C, Ferlet, R, Marquette, JB, Vidal-Madjar, A, Maurice, E, Prevot, L, Aubourg, E, Bareyre, P, Bauer, F, Brehin, S, Coutures, C, de Kat, J, Gros, M, Laurent, B, Lachieze-Rey, M, Lesquoy, E, Magneville, C, Milsztajn, A, Moscoso, L, Queinnec, F, Rich, J, Spiro, M, Vigroux, L, Zylberajch, S, Ansari, R, Cavalier, F, Moniez, M, and Kapteyn Astronomical Institute
Subjects: stars : novae, cataclysmic variables, EXTINCTION, surveys, galaxies : Magellanic Clouds, SPECTRAL EVOLUTION
Abstract: We report the discovery of a slow nova found in the core of the Small Magellanic Cloud by the EROS microlensing survey. Nova SMC 1994 is a classical nova with a DQ Her type lightcurve characterized by a deep minimum. Low amplitude variations occurring on time-scales of hours and days are also detected at maximum light. Spectra collected during the nebular phase indicate that Nova SMC 1994 is similar to Galactic novae of the same class. Large helium enhancement in the shell is found and O and N enrichments are suspected.
Published: 1998

31. 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

32. The effect of metallicity on the Cepheid distance scale and its implications for the Hubble constant ($H_0$) determination

Author: Beaulieu, J. P., Sasselov, D. D., Renault, C., Grison, P., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prévot, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., de Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Gry, C., Guibert, J., Moreau, O., Tajhmady, F., 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), 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 d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), 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), Centre d'Analyse des Images de l'INSU (CENTRE D'ANALYSE DES IMAGES DE L'INSU), Centre National de la Recherche Scientifique (CNRS), EROS, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), 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), 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: galaxies : distances, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Stars : fundamental parameters, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics, Stars : cepheids
Abstract: Recent HST determinations of the expansion's rate of the Universe (the Hubble constant, H_0) assumed that the Cepheid Period-Luminosity relation at V and I are independent of metallicity (Freedman, et al., 1996, Saha et al., 1996, Tanvir et al., 1995). The three groups obtain different vales for H_0. We note that most of this discrepancy stems from the asumption (by both groups) that the Period-Luminosity relation is independent of metallicity. We come to this conclusion as a result of our study of the Period-Luminosity relation of 481 Cepheids with 3 millions two colour measurements in the Large Magellanic Cloud and the Small Magellanic Cloud obtained as a by-product of the EROS microlensing survey. We find that the derived interstellar absorption corrections are particularly sensitive to the metallicity and when our result is applied to recent estimates based on HST Cepheids observations it makes the low-H_0 values higher and the high-H_0 value lower, bringing those discrepant estimates into agrement around $H_0 \approx 70 km/s Mpc^{-1}$., Comment: 4 pages, Latex, with 2 .ps accepted for publication astronomy and astrophysics Letters
Published: 1997

33. Eros Variable Stars: Discovery of Beat Cepheids in the Small Magellanic Cloud and the effect of metallicity on pulsation

Author: Beaulieu, J P., Krockenberger, M., Sasselov, D D., Renault, C., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prvt, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., De Kat, J., Gros, M., Laurent, B., Lachize-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Gry, C., Lantz, Simone, 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), and 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)
Subjects: [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Information need, Bibliographic database, Astrophysics (astro-ph), FOS: Physical sciences, Open access, Information market, Astrophysics, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Scientific research, Electronic document, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Scientific technical information, Technological watch, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Publication, Firm cooperation
Abstract: We report the discovery of eleven beat Cepheids in the Small Magellanic Cloud, using data obtained by the EROS microlensing survey. Four stars are beating in the fundamental and first overtone mode (F/1OT), seven are beating in the first and second overtone (1OT/2OT). The SMC F/1OT ratio is systematically higher than the LMC F/1OT, while the 1OT/2OT period ratio in the SMC Cepheids is the same as the LMC one., 4 pages, Latex file with 4 .ps figures. accepted for publication in A A Letters
Published: 1997

34. Metallicity Effects on the Cepheid Extragalactic Distance Scale from EROS photometry in LMC and SMC

Author: Sasselov, D.D., Beaulieu, J.P., Renault, C., Grison, P., Ferlet, R., Vidal-Madjar, A., Maurice, E., Prévot, L., Aubourg, E., Bareyre, P., Brehin, S., Coutures, C., Delabrouille, N., De Kat, J., Gros, M., Laurent, B., Lachièze-Rey, M., Lesquoy, E., Magneville, C., Milsztajn, A., Moscoso, L., Queinnec, F., Rich, J., Spiro, M., Vigroux, L., Zylberajch, S., Ansari, R., Cavalier, F., Moniez, M., Gry, C., Guibert, J., Moreau, O., Tajhmady, F., Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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 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), 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), Centre d'Analyse des Images de l'INSU (CENTRE D'ANALYSE DES IMAGES DE L'INSU), Centre National de la Recherche Scientifique (CNRS), Girod, Dominique, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), and 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)
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], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics (astro-ph), FOS: Physical sciences, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics
Abstract: This is an investigation of the period-luminosity relation of classical Cepheids in samples of different metallicity. It is based on 481 Cepheids in the Large and Small Magellanic Clouds from the blue and red filter CCD observations (most similar to V_J & R_J) of the French EROS microlensing project. The data-set is complete and provides an excellent basis for a differential analysis between LMC and SMC. In comparison to previous studies of effects on the PL-relation, the EROS data-set offers extremely well-sampled light curves and well-filled instability strips. This allows reliable separation of Cepheids pulsating in the fundamental and the first overtone mode and derivation of differential reddening. Our main result concerns the determination of distances to galaxies which are inferred by using the LMC as a base and using two color photometry to establish the amount of reddening. We find a zero-point offset between SMC and LMC which amounts to a difference between inferred and true distance modulus of 0.14 \pm 0.06 mag in the VI_c system. The offset is exactly the same in both sets of PL-relations - of the fundamental and of the first overtone mode Cepheids. No effect is seen on the slopes of the PL-relations, although the fundamental and the first overtone mode Cepheids have different PL slopes. We attribute the color and the zero-point offset to the difference in metallicity between the SMC and LMC Cepheids. A metallicity effect of that small magnitude still has important consequencies for the inferred Cepheid distances and the determination of H_0. When applied to recent estimates based on HST Cepheid observations, our metallicity dependence makes the low-H_0 values (Sandage et al. 1994) higher and the high-H_0 values (Freedman et al. 1994b) lower, thus bringing those, 14 pages, Latex, with 8 .ps accepted for publication in astronomy and astrophysics
Published: 1997

35. 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

36. A 20 $cm^{2}$ CCD mosaic camera for a dark matter search; 1, mechanics, optics and cryogeny

Author: Arnaud, M, Aubourg, E, Bareyre, P, Bréhin, S, Caridroit, R, De Kat, J, Dispau, G, Djidi, K, Gros, M H, Lachièze-Rey, M, Laigneau, Y, Laurent, B, Lesquoy, E, Lavocat, P, Magneville, C, Mazeau, B, Milshtein, A I, Moscoso, L, Pasquaud, J, Paul, B, Perrin, P, Petibon, J, Piret, Y, Queinnec, F, Rich, J, Spiro, Michel, De Trogoff, J, Vigroux, L, Zylberajch, S, Ansari, R, Cavalier, F, Moniez, M, Beaulieu, J P, Ferlet, R, Grison, P, Vidal-Madjar, A, Adrianzyk, G, Berger, J P, Burnage, R, Delclite, J C, Kohler, D, Magnan, R, Richaud, A, Guibert, J, Moreau, O, Tajahmady, F, Baranne, A, Maurice, E, Prévôt, L, and Gry, C
Subjects: Detectors and Experimental Techniques
Published: 1994

37. A $20 cm^{2}$ CCD mosaic camera for a dark matter search; 2, electronics, data acquisition and performance

Author: Arnaud, M, Aubourg, E, Bareyre, P, Bréhin, S, Caridroit, R, De Kat, J, Dispau, G, Djidi, K, Gros, M H, Lachièze-Rey, M, Laigneau, Y, Laurent, B, Lesquoy, E, Lavocat, P, Magneville, C, Mazeau, B, Milshtein, A I, Moscoso, L, Pasquaud, J, Paul, B, Perrin, P, Petibon, J, Piret, Y, Queinnec, F, Rich, J, Spiro, Michel, De Trogoff, J, Vigroux, L, Zylberajch, S, Ansari, R, Cavalier, F, Moniez, M, Beaulieu, J P, Ferlet, R, Grison, P, Vidal-Madjar, A, Adrianzyk, G, Berger, J P, Burnage, R, Delclite, J C, Kohler, D, Magnan, R, Richaud, A, Guibert, J, Moreau, O, Tajahmady, F, Baranne, A, Maurice, E, Prévôt, L, and Gry, C
Subjects: Detectors and Experimental Techniques
Published: 1994

38. 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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39. 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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40. 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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41. 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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42. 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

43. 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., de Kat, J., Kim, A., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Marquette, J.B., 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., 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., de Kat, J., Kim, A., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Marquette, J.B., 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., and Zylberajch, S.
Published: 1999

44. 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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45. 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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46. 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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47. EROS variable stars: discovery of a slow nova in the SMC

Author: de, Laverny P, Beaulieu, JP, Asplund, M, Kilkenny, D, Renault, C, Ferlet, R, Marquette, JB, Vidal-Madjar, A, Maurice, E, Prevot, L, Aubourg, E, Bareyre, P, Bauer, F, Brehin, S, Coutures, C, de, Kat J, Gros, M, Laurent, B, Lachieze-Rey, M, Lesquoy, E, Magneville, C, Milsztajn, de, Laverny P, Beaulieu, JP, Asplund, M, Kilkenny, D, Renault, C, Ferlet, R, Marquette, JB, Vidal-Madjar, A, Maurice, E, Prevot, L, Aubourg, E, Bareyre, P, Bauer, F, Brehin, S, Coutures, C, de, Kat J, Gros, M, Laurent, B, Lachieze-Rey, M, Lesquoy, E, Magneville, C, and Milsztajn
Abstract: We report the discovery of a slow nova found in the core of the Small Magellanic Cloud by the EROS microlensing survey. Nova SMC 1994 is a classical nova with a DQ Her type lightcurve characterized by a deep minimum. Low amplitude variations occurring on, Addresses: de Laverny P, Univ Montpellier 2, GRAAL, CC72, Pl Bataillon, F-34095 Montpellier 05, France. Astron Observ, S-75120 Uppsala, Sweden. Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands. S African Astron Observ, ZA-7925 Cape Town, South Afric
Published: 1998

48. 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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49. EROS 2 proper motion survey: Constraints on the halo white dwarfs

Author: Goldman, B., primary, Afonso, C., additional, Alard, Ch., additional, Albert, J.-N., additional, Amadon, A., additional, Andersen, J., additional, Ansari, R., additional, Aubourg, É., additional, Bareyre, P., additional, Bauer, F., additional, Beaulieu, J.-Ph., additional, Blanc, G., additional, Bouquet, A., additional, Charlot, X., additional, Couchot, F., additional, Coutures, Ch., additional, Derue, F., additional, Ferlet, R., additional, Fouqué, P., additional, Glicenstein, J.-F., additional, Gould, A., additional, Graff, D., additional, Gros, M., additional, Haïssinski, J., additional, Hamadache, C., additional, Hamilton, J.-Ch., additional, Hardin, D., additional, de Kat, J., additional, Kim, A., additional, Lasserre, Th., additional, Le Guillou, L., additional, Lesquoy, É., additional, Loup, C., additional, Magneville, Ch., additional, Mansoux, B., 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, Regnault, N., additional, Rich, J., additional, Spiro, M., additional, Tisserand, P., additional, Vidal-Madjar, A., additional, Vigroux, L., additional, and Zylberajch, S., additional
Published: 2002
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50. 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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