152 results on '"Fulbright, J. P."'
Search Results
2. Distance determination for RAVE stars using stellar models III: The nature of the RAVE survey and Milky Way chemistry
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Burnett, B., Binney, J., Sharma, S., Williams, M., Zwitter, T., Bienayme, O, Bland-Hawthorn, J., Freeman, K. C., Fulbright, J., Gibson, B., Gilmore, G., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M, Watson, F. G., and Wyse, R. F. G.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
We apply the method of Burnett & Binney (2010) for the determination of stellar distances and parameters to the internal catalogue of the Radial Velocity Experiment (Steinmetz et al. 2006). Subsamples of stars that either have Hipparcos parallaxes or belong to well-studied clusters, inspire confidence in the formal errors. Distances to dwarfs cooler than ~6000 K appear to be unbiased, but those to hotter dwarfs tend to be too small by ~10% of the formal errors. Distances to giants tend to be too large by about the same amount. The median distance error in the whole sample of 216,000 stars is 28% and the error distribution is similar for both giants and dwarfs. Roughly half the stars in the RAVE survey are giants. The giant fraction is largest at low latitudes and in directions towards the Galactic Centre. Near the plane the metallicity distribution is remarkably narrow and centred on [M/H]-0.04 dex; with increasing |z| it broadens out and its median moves to [M/H] ~ -0.5. Mean age as a function of distance from the Galactic centre and distance |z| from the Galactic plane shows the anticipated increase in mean age with |z|., Comment: 14 pages accepted for publication in Astronomy & Astrophysics
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- 2011
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3. The two metallicity groups of the globular cluster M22: a chemical perspective
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Marino, A. F., Sneden, C., Kraft, R. P., Wallerstein, G., Norris, J. E., Da Costa, G., Milone, A. P., Ivans, I. I., Gonzalez, G., Fulbright, J. P., Hilker, M., Piotto, G., Zoccali, M., and Stetson, P. B.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We present a detailed chemical composition analysis of 35 red giant stars in the globular cluster M22. High resolution spectra for this study were obtained at five observatories, and analyzed in a uniform manner. We have determined abundances of representative light proton-capture, alpha, Fe-peak and neutron-capture element groups. Our aim is to better understand the peculiar chemical enrichment history of this cluster, in which two stellar groups are characterized by a different content in iron, neutron capture elements Y, Zr and Ba, and alpha element Ca. The principal results of this study are: (i) substantial star-to-star metallicity scatter (-2.0<[Fe/H]<-1.6); (ii) enhancement of s-process/r-process neutron-capture abundance ratios in a fraction of giants, positively correlated with metallicity; (iii) sharp separation between the s-process rich and s-process poor groups by [La/Eu] ratio; (iv) possible increase of [Cu/Fe] ratios with increasing [Fe/H], suggesting that this element also has a significant s-process component; and (v) presence of Na-O and C-N anticorrelations in both the stellar groups., Comment: 26 pages, 19 figures. Accepted for publication in A&A
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- 2011
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4. The RAdial Velocity Experiment (RAVE): Third Data Release
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Siebert, A., Williams, M. E. K., Siviero, A., Reid, W., Boeche, C., Steinmetz, M., Fulbright, J., Munari, U., Zwitter, T., Watson, F. G., Wyse, R. F. G., de Jong, R. S., Enke, H., Anguiano, B., Burton, D., Cass, C. J. P., Fiegert, K., Hartley, M., Ritter, A., Russel, K. S., Stupar, M., Bienayme, O., Freeman, K. C., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Binney, J., Bland-Hawthorn, J., Campbell, R., Famaey, B., Gerhard, O., Gibson, B. K., Matijevic, G., Parker, Q. A., Seabroke, G. M., Sharma, S., Smith, M. C., and Boer, E. Wylie-de
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Astrophysics - Astrophysics of Galaxies - Abstract
We present the third data release of the RAdial Velocity Experiment (RAVE) which is the first milestone of the RAVE project, releasing the full pilot survey. The catalog contains 83,072 radial velocity measurements for 77,461 stars in the southern celestial hemisphere, as well as stellar parameters for 39,833 stars. This paper describes the content of the new release, the new processing pipeline, as well as an updated calibration for the metallicity based upon the observation of additional standard stars. Spectra will be made available in a future release. The data release can be accessed via the RAVE webpage: http://www.rave-survey.org., Comment: AJ accepted. 54 pages, 20 figures. Figure 17 in low resolution mode
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- 2011
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5. Detection of a radial velocity gradient in the extended local disc with RAVE
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Siebert, A., Famaey, B., Minchev, I., Seabroke, G. M., Binney, J., Burnett, B., Freeman, K. C., Williams, M., Bienayme, O., Bland-Hawthorn, J., Campbell, R., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W. A., Siviero, A., Steinmetz, M., Watson, F., Wyse, R. F. G., and Zwitter, T.
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Astrophysics - Astrophysics of Galaxies - Abstract
Using a sample of 213,713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z|<1 kpc, we report the detection of a velocity gradient of disc stars in the fourth quadrant, directed radially from the Galactic centre. In the direction of the Galactic centre, we apply a simple method independent of stellar proper motions and of Galactic parameters to assess the existence of this gradient in the RAVE data. This velocity gradient corresponds to |K+C| < 3 km/s/kpc, where K and C are the Oort constants measuring the local divergence and radial shear of the velocity field, respectively. In order to illustrate the effect, assuming a zero radial velocity of the Local Standard of Rest we then reconstruct the two-dimensional Galactocentric velocity maps using two different sets of proper motions and photometric distances based either on isochrone fitting or on K-band magnitudes, and considering two sets of values for the Galactocentric radius of the Sun and local circular speed. Further observational confirmation of our finding with line-of-sight velocities of stars at low latitudes, together with further modelling, should help constrain the non-axisymmetric components of the Galactic potential, including the bar, the spiral arms and possibly the ellipticity of the dark halo., Comment: 8 pages, 5 figures, accepted for publication in MNRAS
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- 2010
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6. Testing formation mechanisms of the Milky Way's thick disc with RAVE
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Wilson, Michelle, Helmi, Amina, Morrison, H. L., Breddels, M. A., Bienayme, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G., Siebert, A., Siviero, A., Steinmetz, M., Williams, M. E. K., Wyse, R. F. G., and Zwitter, T.
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Astrophysics - Astrophysics of Galaxies - Abstract
We study the eccentricity distribution of a thick disc sample of stars observed in the Radial Velocity Experiment (RAVE) and compare it to that expected in four simulations of thick disc formation in the literature (accretion of satellites, heating of a primordial thin disc during a merger, radial migration, and gas-rich mergers), as compiled by Sales et al. (2009). We find that the distribution of our sample is peaked at low eccentricities and falls off smoothly and rather steeply to high eccentricities. This distribution is fairly robust to changes in distances, thin disc contamination, and the particular thick disc sample used. Our results are inconsistent with what is expected for the pure accretion simulation, since we find that the dynamics of local thick disc stars implies that the majority must have formed "in situ". Of the remaining models explored, the eccentricity distribution of our stars appears to be most consistent with the gas-rich merger case., Comment: 8 pages, 7 figures, submitted to MNRAS
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- 2010
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7. A search for new members of the beta Pic, Tuc-Hor and epsilon Cha moving groups in the RAVE database
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Kiss, L. L., Moor, A., Szalai, T., Kovacs, J., Bayliss, D., Gilmore, G. F., Bienayme, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M., Watson, F. G., Williams, M., Wyse, R. F. G., and Zwitter, T.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We report on the discovery of new members of nearby young moving groups, exploiting the full power of combining the RAVE survey with several stellar age diagnostic methods and follow-up high-resolution optical spectroscopy. The results include the identification of one new and five likely members of the beta Pictoris moving group, ranging from spectral types F9 to M4 with the majority being M dwarfs, one K7 likely member of the epsilon Cha group and two stars in the Tuc-Hor association. Based on the positive identifications we foreshadow a great potential of the RAVE database in progressing toward a full census of young moving groups in the solar neighbourhood., Comment: 7 pages, 1 figures, accepted for publication in MNRAS
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- 2010
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8. Origins of the Thick Disk as Traced by the Alpha-Elements of Metal-Poor Giant Stars Selected from RAVE
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Ruchti, G. R., Fulbright, J. P., Wyse, R. F. G., Gilmore, G. F., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Gibson, B. K., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M., Watson, F. G., Williams, M., and Zwitter, T.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Theories of thick disk formation can be differentiated by measurements of stellar elemental abundances. We have undertaken a study of metal-poor stars selected from the RAVE spectroscopic survey of bright stars to establish whether or not there is a significant population of metal-poor thick-disk stars ([Fe/H] <~ -1.0) and to measure their elemental abundances. In this paper, we present abundances of four alpha-elements (Mg, Si, Ca, Ti) and iron for a subsample of 212 RGB and 31 RC/HB stars from this study. We find that the [alpha/Fe] ratios are enhanced implying that enrichment proceeded by purely core-collapse supernovae. This requires that star formation in each star forming region had a short duration. The relative lack of scatter in the [alpha/Fe] ratios implies good mixing in the ISM prior to star formation. In addition, the ratios resemble that of the halo, indicating that the halo and thick disk share a similar massive star IMF. We conclude that the alpha enhancement of the metal-poor thick disk implies that direct accretion of stars from dwarf galaxies similar to surviving dwarf galaxies today did not play a major role in the formation of the thick disk., Comment: 11 pages, 2 figures, accepted by ApJ Letters
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- 2010
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9. Distance determination for RAVE stars using stellar models II: Most likely values assuming a standard stellar evolution scenario
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Zwitter, T., Matijevič, G., Breddels, M. A., Smith, M. C., Helmi, A., Munari, U., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Boeche, C., Brown, A. G. A., Campbell, R., Freeman, K. C., Fulbright, J., Gibson, B., Gilmore, G., Grebel, E. K., Navarro, J. F., Parker, Q. A., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M., Watson, F. G., Williams, M., and Wyse, R. F. G.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The RAdial Velocity Experiment (RAVE) is a spectroscopic survey of the Milky Way. We use the subsample of spectra with spectroscopically determined values of stellar parameters to determine the distances to these stars. The list currently contains 235,064 high quality spectra which show no peculiarities and belong to 210,872 different stars. The numbers will grow as the RAVE survey progresses. The public version of the catalog will be made available through the CDS services along with the ongoing RAVE public data releases. The distances are determined with a method based on the work by Breddels et al.~(2010). Here we assume that the star undergoes a standard stellar evolution and that its spectrum shows no peculiarities. The refinements include: the use of either of the three isochrone sets, a better account of the stellar ages and masses, use of more realistic errors of stellar parameter values, and application to a larger dataset. The derived distances of both dwarfs and giants match within ~21% to the astrometric distances of Hipparcos stars and to the distances of observed members of open and globular clusters. Multiple observations of a fraction of RAVE stars show that repeatability of the derived distances is even better, with half of the objects showing a distance scatter of \simlt 11%. RAVE dwarfs are ~300 pc from the Sun, and giants are at distances of 1 to 2 kpc, and up to 10 kpc. This places the RAVE dataset between the more local Geneva-Copenhagen survey and the more distant and fainter SDSS sample. As such it is ideal to address some of the fundamental questions of Galactic structure and evolution in the pre-Gaia era. Individual applications are left to separate papers, here we show that the full 6-dimensional information on position and velocity is accurate enough to discuss the vertical structure and kinematic properties of the thin and thick disks., Comment: Accepted for publication in Astronomy and Astrophysics. 16 pages, 15 figures, data to be available via CDS. Includes a "Note added in proofs"
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- 2010
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10. RAVE spectroscopy of luminous blue variables in the Large Magellanic Cloud
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Munari, U., Siviero, A., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G. M., Siebert, A., Steinmetz, M., Watson, F. G., Williams, M., Wyse, R. F. G., and Zwitter, T.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
CONTEXT: The RAVE spectroscopic survey for galactic structure and evolution obtains 8400-8800 Ang spectra at 7500 resolving power at the UK Schmidt Telescope using the 6dF multi-fiber positioner. More than 300,000 925 deg southern stars have been observed to date. AIMS: This paper presents the first intrinsic examination of stellar spectra from the RAVE survey, aimed at evaluating their diagnostic potential for peculiar stars and at contributing to the general understanding of Luminous Blue Variables (LBVs). METHODS: We used the multi-epoch spectra for all seven LBVs observed, between 2005 and 2008, in the Large Magellanic Cloud (LMC) by the RAVE survey. RESULTS: We demonstrate that RAVE spectra possess significant diagnostic potential when applied to peculiar stars and, in particular, LBVs. The behaviour of the radial velocities for both emission and absorption lines, and the spectral changes between outburst and quiescence states are described and found to agree with evidence gathered at more conventional wavelengths. The wind outflow signatures and their variability are investigated, with multi-components detected in S Doradus. Photoionisation modelling of the rich emission line spectrum of R 127 shows evidence of a massive detached ionised shell that was ejected during the 1982-2000 outburst. Surface inhomogeneities in the nuclear-processed material, brought to the surface by heavy mass loss, could have been observed in S Doradus, even if alternative explanations are possible. We also detect the transition from quiescence to outburst state in R 71. Finally, our spectrum of R 84 offers one of the clearest views of its cool companion., Comment: accepted for publication in Astronomy and Astrophysics
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- 2009
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11. Trumpler 20 - an old and rich open cluster
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Platais, I., Melo, C., Fulbright, J. P., Kozhurina-Platais, V., Figueira, P., Barnes, S. A., and Mendez, R. A.
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Astrophysics - Abstract
We show that the open cluster Trumpler 20, contrary to the earlier findings, is actually an old Galactic open cluster. New CCD photometry and high-resolution spectroscopy are used to derive the main parameters of this cluster. At [Fe/H]=-0.11 for a single red giant star, the metallicity is slightly subsolar. The best fit to the color-magnitude diagrams is achieved using a 1.3 Gyr isochrone with convective overshoot. The cluster appears to have a significant reddening at E(B-V)=0.46 (for B0 spectral type), although for red giants this high reddening yields the color temperature exceeding the spectroscopic T_eff by about 200 K. Trumpler 20 is a very rich open cluster, containing at least 700 members brighter than M_V=+4. It may extend over the field-of-view available in our study at 20'x20'., Comment: 7 pages, 5 figures; accepted for publication in MNRAS
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- 2008
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12. The Radial Velocity Experiment (RAVE): second data release
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Zwitter, T., Siebert, A., Munari, U., Freeman, K. C., Siviero, A., Watson, F. G., Fulbright, J. P., Wyse, R. F. G., Campbell, R., Seabroke, G. M., Williams, M., Steinmetz, M., Bienayme, O., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Anguiano, B., Boeche, C., Burton, D., Cass, P., Dawe, J., Fiegert, K., Hartley, M., Russell, K., Veltz, L., Bailin, J., Binney, J., Bland-Hawthorn, J., Brown, A., Dehnen, W., Evans, N. W., Fiorentin, P. Re, Fiorucci, M., Gerhard, O., Gibson, B., Kelz, A., Kujken, K., Matijevic, G., Minchev, I., Parker, Q. A., Penarrubia, J., Quillen, A., Read, M. A., Reid, W., Roeser, S., Ruchti, G., Scholz, R. -D., Smith, M. C., Sordo, R., Tolstoi, E., Tomasella, L., Vidrih, S., and de Boer, E. Wylie
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Astrophysics - Abstract
We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities (RVs) and stellar atmosphere parameters of up to one million stars using the 6dF multi-object spectrograph on the 1.2-m UK Schmidt Telescope of the Anglo-Australian Observatory (AAO). It is obtaining medium resolution spectra (median R=7,500) in the Ca-triplet region (8,410--8,795 \AA) for southern hemisphere stars in the magnitude range 9
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- 2008
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13. The Evolution of Oxygen and Magnesium in the Bulge and Disk of the Milky Way
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McWilliam, A., Matteucci, F., Ballero, S., Rich, R. M., Fulbright, J. P., and Cescutti, G.
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Astrophysics - Abstract
We show that the Galactic bulge and disk share a similar, strong, decline in [O/Mg] ratio with [Mg/H]. The similarity of the [O/Mg] trend in these two, markedly different, populations suggests a metallicity-dependent modulation of the stellar yields from massive stars, by mass loss from winds, and related to the Wolf-Rayet phenomenon, as proposed by McWilliam & Rich (2004). We have modified existing models for the chemical evolution of the Galactic bulge and the solar neighborhood with the inclusion of metallicity-dependent oxygen yields from theoretical predictions for massive stars that include mass loss by stellar winds. Our results significantly improve the agreement between predicted and observed [O/Mg] ratios in the bulge and disk above solar metallicity; however, a small zero-point normalization problem remains to be resolved. The zero-point shift indicates that either the semi-empirical yields of Francois et al. (2004) need adjustment, or that the bulge IMF is not quite as flat as found by Ballero et al. (2007); the former explanation is preferred. Our result removes a previous inconsistency between the interpretation of [O/Fe] and [Mg/Fe] ratios in the bulge, and confirms the conclusion that the bulge formed more rapidly than the disk, based on the over-abundances of elements produced by massive stars. We also provide an explanation for the long-standing difference between [Mg/Fe] and [O/Fe] trends among disk stars more metal-rich than the sun., Comment: 22 pages including 5 figures. Submitted to the Astronomical Journal
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- 2007
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14. The RAVE Survey: Constraining the Local Galactic Escape Speed
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Smith, M. C., Ruchti, G. R., Helmi, A., Wyse, R. F. G., Fulbright, J. P., Freeman, K. C., Navarro, J. F., Seabroke, G. M., Steinmetz, M., Williams, M., Bienayme, O., Binney, J., Bland-Hawthorn, J., Dehnen, W., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Parker, Q. A., Scholz, R. -D., Siebert, A., Watson, F. G., and Zwitter, T.
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Astrophysics - Abstract
We report new constraints on the local escape speed of our Galaxy. Our analysis is based on a sample of high velocity stars from the RAVE survey and two previously published datasets. We use cosmological simulations of disk galaxy formation to motivate our assumptions on the shape of the velocity distribution, allowing for a significantly more precise measurement of the escape velocity compared to previous studies. We find that the escape velocity lies within the range $498\kms < \ve < 608 \kms$ (90 per cent confidence), with a median likelihood of $544\kms$. The fact that $\ve^2$ is significantly greater than $2\vc^2$ (where $\vc=220\kms$ is the local circular velocity) implies that there must be a significant amount of mass exterior to the Solar circle, i.e. this convincingly demonstrates the presence of a dark halo in the Galaxy. For a simple isothermal halo, one can calculate that the minimum radial extent is $\sim58$ kpc. We use our constraints on $\ve$ to determine the mass of the Milky Way halo for three halo profiles. For example, an adiabatically contracted NFW halo model results in a virial mass of $1.42^{+1.14}_{-0.54}\times10^{12}M_\odot$ and virial radius of $305^{+66}_{-45}$ kpc (90 per cent confidence). For this model the circular velocity at the virial radius is $142^{+31}_{-21}\kms$. Although our halo masses are model dependent, we find that they are in good agreement with each other., Comment: 19 pages, 9 figures, MNRAS (accepted). v2 incorporates minor cosmetic revisions which have no effect on the results or conclusions
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- 2006
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15. WIYN Open Cluster Study. XXVI. Improved kinematic membership and spectroscopy of IC 2391
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Platais, I., Melo, C., Mermilliod, J. -C., Kozhurina-Platais, V., Fulbright, J. P., Mendez, R. A., Altmann, M., and Sperauskas, J.
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Astrophysics - Abstract
[Abridged] Contex. Young open clusters provide important clues to the interface between the main sequence and pre-main-sequence phases of stellar evolution. The young and nearby open cluster IC 2391 is well-suited to studies of these two evolutionary phases. Aims. We establish a bona fide set of cluster members and then analyze this set in terms of binary frequency, projected rotational velocities, [Fe/H], and lithium abundance. In the wake of the Hipparcos distance controversy for the Pleiades, we compare the main-sequence fitting distance modulus to the Hipparcos mean parallax for IC 2391. Results. The proper-motion survey covers a 6 times larger sky area than the prior targeted searches for cluster members in IC 2391. A total of 66 stars are considered bona fide cluster members down to a mass equivalent to 0.5M_sun. A quarter of them have been newly identified with many in the F2-K5 spectral range, which is crucial for a main-sequence fit. We find a mean [Fe/H] value of +0.06+/-0.06, when a solar abundance of log epsilon (Fe)=7.45 is adopted. The main sequence fitting yields a distance modulus that is 0.19 mag larger than that derived from Hipparcos parallaxes; thus this offset nearly has the size of a similar offset found for the Pleiades. The Li abundance pattern is similar to the earlier findings and is typical for a 40 Myr old open cluster., Comment: 18 pages, 11 figures, Astronomy & Astrophysics, in press
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- 2006
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16. The Radial Velocity Experiment (RAVE): first data release
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Steinmetz, M., Zwitter, T., Siebert, A., Watson, F. G., Freeman, K. C., Munari, U., Campbell, R., Williams, M., Seabroke, G. M., Wyse, R. F. G., Parker, Q. A., Bienayme, O., Roeser, S., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Burton, D., Cass, C. J. P., Dawe, J. A., Fiegert, K., Hartley, M., Russell, K. S., Saunders, W., Enke, H., Bailin, J., Binney, J., Bland-Hawthorn, J., Boeche, C., Dehnen, W., Eisenstein, D. J., Evans, N. W., Fiorucci, M., Fulbright, J. P., Gerhard, O., Jauregi, U., Kelz, A., Mijovic, L., Minchev, I., Parmentier, G., Penarrubia, J., Quillen, A. C., Read, M. A., Ruchti, G., Scholz, R. -D., Siviero, A., Smith, M. C., Sordo, R., Veltz, L., Vidrih, S., von Berlepsch, R., Boyle, B. J., and Schilbach, E.
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Astrophysics - Abstract
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity, surface gravity) of up to one million stars using the 6dF multi-object spectrograph on the 1.2-m UK Schmidt Telescope of the Anglo-Australian Observatory (AAO). The RAVE program started in 2003, obtaining medium resolution spectra (median R=7,500) in the Ca-triplet region ($\lambda\lambda$ 8,410--8,795 \AA) for southern hemisphere stars drawn from the Tycho-2 and SuperCOSMOS catalogs, in the magnitude range 9
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- 2006
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17. Manganese Abundances in Cluster and Field Stars
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Sobeck, J. S., Ivans, I. I., Simmerer, J. A., Sneden, C., Hoeflich, P., Fulbright, J. P., and Kraft, R. P.
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Astrophysics - Abstract
We have derived Mn abundances for more than 200 stars in 19 globular clusters. In addition, Mn abundance determinations have been made for a comparable number of halo field and disk stars possessing an overlapping range of metallicities and stellar parameters. Our primary data set was comprised of high resolution spectra previously acquired at the McDonald, Lick and Keck Observatories. To enlarge our data pool, we acquired globular and open cluster spectra from several other investigators. Data were analyzed using synthetic spectra of the 6000 \AA Mn I triplet. Hyperfine structure parameters were included in the synthetic spectra computations. Our analysis shows that for the metallicity range $-0.7>$[Fe/H]$>$$-$2.7 stars of 19 globular clusters have a a mean relative abundance of $<$[Mn/Fe]$>$= $-0.37\pm0.01$ ($\sigma$ = 0.10), a value in agreement with that of the field stars: $<$[Mn/Fe]$>$= $-0.36\pm0.01$ ($\sigma$ = 0.08). Despite the 2 orders of magnitude span in metallicity, the $<$[Mn/Fe]$>$ ratio remains constant in both stellar populations. Our Mn abundance data indicate that there is no appreciable variation in the relative nucleosynthetic contribution from massive stars that undergo core-collapse supernovae and thus, no significant change of the associated initial mass function in the specified metallicity range., Comment: 43 Pages, 7 Figures; amended typos
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- 2006
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18. A New Population of Old Stars
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Ivans, I. I., Sneden, C., James, C. R., Preston, G. W., Fulbright, J. P., Hoeflich, P. A., Carney, B. W., and Wheeler, J. C.
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Astrophysics - Abstract
We report the results of a coherent study of three chemically anomalous metal-poor ([Fe/H] ~ -2) stars. These objects exhibit unusually low abundances of Mg, Si, Ca (alpha-elements) and Sr, Y, and Ba (neutron-capture elements). Our analyses confirm and expand upon earlier reports of atypical abundances in BD+80~245, G4-36, and CS22966-043. We also find that the latter two stars exhibit enhanced abundances of Cr, Mn, Ni, and Zn (iron-peak elements), along with what appears to be large abundances of Ga, with respect to the abundance of iron. Comparing the chemical abundances of these stars to supernova model yields, we derive supernovae ratios of Type Ia versus Type II events in the range of 0.6 <= (N_Ia/N_II) <= 1.3. Whereas, for the Sun, we derive supernovae ratios in good agreement with those found in the literature: 0.18 +/- 0.01 < (N_Ia/N_II)_sun < 0.25 +/- 0.06. Given the relatively low metallicity and high (N_Ia/N_II) ratios of the low-alpha stars studied here, these objects may have witnessed, or been born from material produced in the yields of the earliest supernova Type Ia events., Comment: 8 pages, 2 tables, 1 colour figure, to appear in Carnegie Observatories Astrophysics Series, Vol. 4: Origin and Evolution of the Elements, ed. A. McWilliam and M. Rauch (Pasadena: Carnegie Observatories)
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- 2003
19. Getting the Red Out: A Stellar Approach to Determining Spatial Variations of Interstellar Dust
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Ivans, I. I., Sneden, C., Kraft, R. P., Suntzeff, N. B., Smith, V. V., Langer, G. E., and Fulbright, J. P.
- Subjects
Astrophysics - Abstract
By employing two different spectroscopic techniques we have mapped out the variable ISM dust extinction endemic to globular cluster M4. We derive an average E(B-V) reddening of 0.33 +/- 0.01 and R = 3.4 +/- 0.4, both in good agreement with previous studies of M4. For individual stars in the most heavily reddened regions of M4, we find E(B-V) values significantly higher than those inferred by studies of interstellar gas; for heavily reddened regions, the gas measured in column density measurements may not completely trace the dust., Comment: 4 pages, 1 figure, to appear in Revista Mexicana de Astronomia y Astrofisica Serie de Conferencias: ``The Seventh Texas-Mexico Conference on Astrophysics: Glows, Flows & Blows'' April 6-8, 2000, Austin, Texas
- Published
- 2000
20. The Isotopic Oxygen Nightglow as Viewed from Mauna Kea
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Slanger, T. G., Huestis, D. L., Osterbrock, D. E., and Fulbright, J. P.
- Published
- 1997
21. Constitutional Diplomacy
- Author
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Glennon, Michael J., Fulbright, J. William, with a foreword by, Glennon, Michael J., and Fulbright, J. William
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- 2020
- Full Text
- View/download PDF
22. Abundance surveys of metal-rich bulge stars
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Fulbright, J. P., primary, Rich, R. M., additional, and McWilliam, A., additional
- Published
- 2008
- Full Text
- View/download PDF
23. Trumpler 20 - an old and rich open cluster
- Author
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Platais, I., Melo, C., Fulbright, J. P., Kozhurina-Platais, V., Figueira, P., Barnes, S. A., Méndez, R. A., Platais, I., Melo, C., Fulbright, J. P., Kozhurina-Platais, V., Figueira, P., Barnes, S. A., and Méndez, R. A.
- Abstract
We show that the open cluster Trumpler 20, contrary to the earlier findings, is actually an old Galactic open cluster. New CCD photometry and high-resolution spectroscopy are used to derive the main parameters of this cluster. At [Fe/H]=−0.11 for a single red giant star, the metallicity is slightly subsolar. The best fit to the colour-magnitude diagrams is achieved using a 1.3-Gyr isochrone with convective overshoot. The cluster appears to have a significant reddening at E(B−V) = 0.46 (for B0 spectral type), although for red giants this high reddening yields the colour temperature exceeding the spectroscopic Teff by about 200 K. Trumpler 20 is a very rich open cluster, containing at least 700 members brighter than MV=+4. It may extend over the field of view available in our study at 20 × 20 arcmin2
- Published
- 2017
24. The RAVE survey: constraining the local Galactic escape speed
- Author
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Smith, Martin C., Ruchti, Gregory R., Helmi, Amina, Wyse, Rosemary F. G., Fulbright, J. P., Freeman, K. C., Navarro, J. F., Seabroke, G. M., Steinmetz, M., Williams, M., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Dehnen, W., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Parker, Q. A., Scholz, R.-D, Siebert, A., Watson, F. G., Zwitter, T., Smith, Martin C., Ruchti, Gregory R., Helmi, Amina, Wyse, Rosemary F. G., Fulbright, J. P., Freeman, K. C., Navarro, J. F., Seabroke, G. M., Steinmetz, M., Williams, M., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Dehnen, W., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Parker, Q. A., Scholz, R.-D, Siebert, A., Watson, F. G., and Zwitter, T.
- Abstract
We report new constraints on the local escape speed of our Galaxy. Our analysis is based on a sample of high-velocity stars from the RAVE survey and two previously published data sets. We use cosmological simulations of disc galaxy formation to motivate our assumptions on the shape of the velocity distribution, allowing for a significantly more precise measurement of the escape velocity compared to previous studies. We find that the escape velocity lies within the range 498 < vesc < 608 km s−1 (90 per cent confidence), with a median likelihood of 544 km s−1. The fact that v2esc is significantly greater than 2v2circ (where vcirc= 220 km s−1 is the local circular velocity) implies that there must be a significant amount of mass exterior to the solar circle, that is, this convincingly demonstrates the presence of a dark halo in the Galaxy. We use our constraints on vesc to determine the mass of the Milky Way halo for three halo profiles. For example, an adiabatically contracted NFW halo model results in a virial mass of 1.42+1.14−0.54× 1012 M⊙ and virial radius of (90 per cent confidence). For this model the circular velocity at the virial radius is 142+31−21 km s−1. Although our halo masses are model dependent, we find that they are in good agreement with each other
- Published
- 2017
25. Testing formation mechanisms of the Milky Way's thick disc with RAVE
- Author
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Wilson, Michelle L., Helmi, Amina, Morrison, Heather L., Breddels, Maarten A., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G., Siebert, A., Siviero, A., Steinmetz, M., Williams, M. E. K., Wyse, R. F. G., Zwitter, T., Wilson, Michelle L., Helmi, Amina, Morrison, Heather L., Breddels, Maarten A., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G., Siebert, A., Siviero, A., Steinmetz, M., Williams, M. E. K., Wyse, R. F. G., and Zwitter, T.
- Published
- 2011
26. Detection of a radial velocity gradient in the extended local disc with RAVE
- Author
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Siebert, A., Famaey, B., Minchev, I., Seabroke, G. M., Binney, J., Burnett, B., Freeman, K. C., Williams, M., Bienaymé, O., Bland-Hawthorn, J., Campbell, R., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W. A., Siviero, A., Steinmetz, M., Watson, F., Wyse, R. F. G., Zwitter, T., Siebert, A., Famaey, B., Minchev, I., Seabroke, G. M., Binney, J., Burnett, B., Freeman, K. C., Williams, M., Bienaymé, O., Bland-Hawthorn, J., Campbell, R., Fulbright, J. P., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W. A., Siviero, A., Steinmetz, M., Watson, F., Wyse, R. F. G., and Zwitter, T.
- Published
- 2011
27. THE DAWNING OF THE STREAM OF AQUARIUS IN RAVE
- Author
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Williams, M. E. K., Steinmetz, M., Sharma, S., Bland-Hawthorn, J., de Jong, R. S., Seabroke, G. M., Helmi, A., Freeman, K. C., Binney, J., Minchev, I., Bienaymé, O., Campbell, R., Fulbright, J. P., Gibson, B. K., Gilmore, G. F., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Siebert, A., Siviero, A., Watson, F. G., Wyse, R. F. G., Zwitter, T., Williams, M. E. K., Steinmetz, M., Sharma, S., Bland-Hawthorn, J., de Jong, R. S., Seabroke, G. M., Helmi, A., Freeman, K. C., Binney, J., Minchev, I., Bienaymé, O., Campbell, R., Fulbright, J. P., Gibson, B. K., Gilmore, G. F., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Siebert, A., Siviero, A., Watson, F. G., Wyse, R. F. G., and Zwitter, T.
- Published
- 2011
28. A search for new members of the β Pictoris, Tucana-Horologium and ε Cha moving groups in the RAVE data base
- Author
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Kiss, L. L., Moór, A., Szalai, T., Kovács, J., Bayliss, D., Gilmore, G. F., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M., Watson, F. G., Williams, M., Wyse, R. F. G., Zwitter, T., Kiss, L. L., Moór, A., Szalai, T., Kovács, J., Bayliss, D., Gilmore, G. F., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., Seabroke, G. M., Siebert, A., Siviero, A., Steinmetz, M., Watson, F. G., Williams, M., Wyse, R. F. G., and Zwitter, T.
- Published
- 2010
29. THE RAVE CATALOG OF STELLAR ELEMENTAL ABUNDANCES: FIRST DATA RELEASE
- Author
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Boeche, C., primary, Siebert, A., additional, Williams, M., additional, de Jong, R. S., additional, Steinmetz, M., additional, Fulbright, J. P., additional, Ruchti, G. R., additional, Bienaymé, O., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Freeman, K. C., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Helmi, A., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Seabroke, G. M., additional, Siviero, A., additional, Watson, F. G., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2011
- Full Text
- View/download PDF
30. The two metallicity groups of the globular cluster M 22: a chemical perspective
- Author
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Marino, A. F., primary, Sneden, C., additional, Kraft, R. P., additional, Wallerstein, G., additional, Norris, J. E., additional, Da Costa, G., additional, Milone, A. P., additional, Ivans, I. I., additional, Gonzalez, G., additional, Fulbright, J. P., additional, Hilker, M., additional, Piotto, G., additional, Zoccali, M., additional, and Stetson, P. B., additional
- Published
- 2011
- Full Text
- View/download PDF
31. Testing formation mechanisms of the Milky Way's thick disc with RAVE
- Author
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Wilson, Michelle L., primary, Helmi, Amina, additional, Morrison, Heather L., additional, Breddels, Maarten A., additional, Bienaymé, O., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Freeman, K. C., additional, Fulbright, J. P., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Seabroke, G., additional, Siebert, A., additional, Siviero, A., additional, Steinmetz, M., additional, Williams, M. E. K., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2011
- Full Text
- View/download PDF
32. Detection of a radial velocity gradient in the extended local disc with RAVE
- Author
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Siebert, A., primary, Famaey, B., additional, Minchev, I., additional, Seabroke, G. M., additional, Binney, J., additional, Burnett, B., additional, Freeman, K. C., additional, Williams, M., additional, Bienaymé, O., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Fulbright, J. P., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Helmi, A., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W. A., additional, Siviero, A., additional, Steinmetz, M., additional, Watson, F., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2011
- Full Text
- View/download PDF
33. THE DAWNING OF THE STREAM OF AQUARIUS IN RAVE
- Author
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Williams, M. E. K., primary, Steinmetz, M., additional, Sharma, S., additional, Bland-Hawthorn, J., additional, de Jong, R. S., additional, Seabroke, G. M., additional, Helmi, A., additional, Freeman, K. C., additional, Binney, J., additional, Minchev, I., additional, Bienaymé, O., additional, Campbell, R., additional, Fulbright, J. P., additional, Gibson, B. K., additional, Gilmore, G. F., additional, Grebel, E. K., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Siebert, A., additional, Siviero, A., additional, Watson, F. G., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2011
- Full Text
- View/download PDF
34. A search for new members of the β Pictoris, Tucana-Horologium and ε Cha moving groups in the RAVE data base
- Author
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Kiss, L. L., primary, Moór, A., additional, Szalai, T., additional, Kovács, J., additional, Bayliss, D., additional, Gilmore, G. F., additional, Bienaymé, O., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Freeman, K. C., additional, Fulbright, J. P., additional, Gibson, B. K., additional, Grebel, E. K., additional, Helmi, A., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Seabroke, G. M., additional, Siebert, A., additional, Siviero, A., additional, Steinmetz, M., additional, Watson, F. G., additional, Williams, M., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2010
- Full Text
- View/download PDF
35. ORIGINS OF THE THICK DISK AS TRACED BY THE ALPHA ELEMENTS OF METAL-POOR GIANT STARS SELECTED FROM RAVE
- Author
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Ruchti, G. R., primary, Fulbright, J. P., additional, Wyse, R. F. G., additional, Gilmore, G. F., additional, Bienaymé, O., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Freeman, K. C., additional, Gibson, B. K., additional, Grebel, E. K., additional, Helmi, A., additional, Munari, U., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Seabroke, G. M., additional, Siebert, A., additional, Siviero, A., additional, Steinmetz, M., additional, Watson, F. G., additional, Williams, M., additional, and Zwitter, T., additional
- Published
- 2010
- Full Text
- View/download PDF
36. RAVE spectroscopy of luminous blue variables in the Large Magellanic Cloud
- Author
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Munari, U., primary, Siviero, A., additional, Bienaymé, O., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Campbell, R., additional, Freeman, K. C., additional, Fulbright, J. P., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Helmi, A., additional, Navarro, J. F., additional, Parker, Q. A., additional, Reid, W., additional, Seabroke, G. M., additional, Siebert, A., additional, Steinmetz, M., additional, Watson, F. G., additional, Williams, M., additional, Wyse, R. F. G., additional, and Zwitter, T., additional
- Published
- 2009
- Full Text
- View/download PDF
37. Trumpler 20 - an old and rich open cluster★†‡
- Author
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Platais, I., primary, Melo, C., additional, Fulbright, J. P., additional, Kozhurina-Platais, V., additional, Figueira, P., additional, Barnes, S. A., additional, and Méndez, R. A., additional
- Published
- 2008
- Full Text
- View/download PDF
38. THE RADIAL VELOCITY EXPERIMENT (RAVE): SECOND DATA RELEASE
- Author
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Zwitter, T., primary, Siebert, A., additional, Munari, U., additional, Freeman, K. C., additional, Siviero, A., additional, Watson, F. G., additional, Fulbright, J. P., additional, Wyse, R. F. G., additional, Campbell, R., additional, Seabroke, G. M., additional, Williams, M., additional, Steinmetz, M., additional, Bienaymé, O., additional, Gilmore, G., additional, Grebel, E. K., additional, Helmi, A., additional, Navarro, J. F., additional, Anguiano, B., additional, Boeche, C., additional, Burton, D., additional, Cass, P., additional, Dawe, J., additional, Fiegert, K., additional, Hartley, M., additional, Russell, K., additional, Veltz, L., additional, Bailin, J., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Brown, A., additional, Dehnen, W., additional, Evans, N. W., additional, Fiorentin, P. Re, additional, Fiorucci, M., additional, Gerhard, O., additional, Gibson, B., additional, Kelz, A., additional, Kujken, K., additional, Matijevič, G., additional, Minchev, I., additional, Parker, Q. A., additional, Peñarrubia, J., additional, Quillen, A., additional, Read, M. A., additional, Reid, W., additional, Roeser, S., additional, Ruchti, G., additional, Scholz, R.-D., additional, Smith, M. C., additional, Sordo, R., additional, Tolstoi, E., additional, Tomasella, L., additional, Vidrih, S., additional, and de Boer, E. Wylie, additional
- Published
- 2008
- Full Text
- View/download PDF
39. THE EVOLUTION OF OXYGEN AND MAGNESIUM IN THE BULGE AND DISK OF THE MILKY WAY
- Author
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McWilliam, A., primary, Matteucci, F., additional, Ballero, S., additional, Rich, R. M., additional, Fulbright, J. P., additional, and Cescutti, G., additional
- Published
- 2008
- Full Text
- View/download PDF
40. The RAVE survey: constraining the local Galactic escape speed
- Author
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Smith, M. C., primary, Ruchti, G. R., additional, Helmi, A., additional, Wyse, R. F. G., additional, Fulbright, J. P., additional, Freeman, K. C., additional, Navarro, J. F., additional, Seabroke, G. M., additional, Steinmetz, M., additional, Williams, M., additional, Bienayme, O., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Dehnen, W., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Munari, U., additional, Parker, Q. A., additional, Scholz, R.- D., additional, Siebert, A., additional, Watson, F. G., additional, and Zwitter, T., additional
- Published
- 2007
- Full Text
- View/download PDF
41. WIYN open cluster study
- Author
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Platais, I., primary, Melo, C., additional, Mermilliod, J.-C., additional, Kozhurina-Platais, V., additional, Fulbright, J. P., additional, Méndez, R. A., additional, Altmann, M., additional, and Sperauskas, J., additional
- Published
- 2006
- Full Text
- View/download PDF
42. The Radial Velocity Experiment (RAVE): First Data Release
- Author
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Steinmetz, M., primary, Zwitter, T., additional, Siebert, A., additional, Watson, F. G., additional, Freeman, K. C., additional, Munari, U., additional, Campbell, R., additional, Williams, M., additional, Seabroke, G. M., additional, Wyse, R. F. G., additional, Parker, Q. A., additional, Bienaymé, O., additional, Roeser, S., additional, Gibson, B. K., additional, Gilmore, G., additional, Grebel, E. K., additional, Helmi, A., additional, Navarro, J. F., additional, Burton, D., additional, Cass, C. J. P., additional, Dawe, J. A., additional, Fiegert, K., additional, Hartley, M., additional, Russell, K. S., additional, Saunders, W., additional, Enke, H., additional, Bailin, J., additional, Binney, J., additional, Bland-Hawthorn, J., additional, Boeche, C., additional, Dehnen, W., additional, Eisenstein, D. J., additional, Evans, N. W., additional, Fiorucci, M., additional, Fulbright, J. P., additional, Gerhard, O., additional, Jauregi, U., additional, Kelz, A., additional, Mijović, L., additional, Minchev, I., additional, Parmentier, G., additional, Peñarrubia, J., additional, Quillen, A. C., additional, Read, M. A., additional, Ruchti, G., additional, Scholz, R.-D., additional, Siviero, A., additional, Smith, M. C., additional, Sordo, R., additional, Veltz, L., additional, Vidrih, S., additional, von Berlepsch, R., additional, Boyle, B. J., additional, and Schilbach, E., additional
- Published
- 2006
- Full Text
- View/download PDF
43. WIYN open cluster study
- Author
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Platais, I., Melo, C., Mermilliod, J.-C., Kozhurina-Platais, V., Fulbright, J. P., Méndez, R. A., Altmann, M., Sperauskas, J., Platais, I., Melo, C., Mermilliod, J.-C., Kozhurina-Platais, V., Fulbright, J. P., Méndez, R. A., Altmann, M., and Sperauskas, J.
- Abstract
Context.Young open clusters provide important clues to the interface between the main sequence and pre-main-sequence phases of stellar evolution. The young and nearby open cluster IC 2391 is well-suited to studies of these two evolutionary phases.
- Published
- 2007
- Full Text
- View/download PDF
44. Night-Sky High-Resolution Spectral Atlas of OH Emission Lines for Echelle Spectrograph Wavelength Calibration. II.
- Author
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Osterbrock, D. E., primary, Fulbright, J. P., additional, and Bida, T. A., additional
- Published
- 1997
- Full Text
- View/download PDF
45. A search for new members of the β Pictoris, Tucana-Horologium and ε Cha moving groups in the RAVE data base.
- Author
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Kiss, L. L., Moór, A., Szalai, T., Kovács, J., Bayliss, D., Gilmore, G. F., Bienaymé, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., Fulbright, J. P., Gibson, B. K., Grebel, E. K., Helmi, A., Munari, U., Navarro, J. F., Parker, Q. A., Reid, W., and Seabroke, G. M.
- Subjects
AGE of stars ,RADIAL velocity of stars ,BINARY stars ,OPTICAL spectroscopy ,DWARF stars ,STELLAR spectra ,POTENTIAL theory (Physics) - Abstract
We report on the discovery of new members of nearby young moving groups, exploiting the full power of combining the Radial Velocity Experiment (RAVE) survey with several stellar age diagnostic methods and follow-up high-resolution optical spectroscopy. The results include the identification of one new and five likely members of the β Pictoris moving group, ranging from spectral types F9 to M4 with the majority being M dwarfs, one K7 likely member of the ε Cha group and two stars in the Tucana-Horologium association. Based on the positive identifications, we foreshadow a great potential of the RAVE data base in progressing towards a full census of young moving groups in the solar neighbourhood. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
46. A Quarter-Century of Educational Exchange: Values and Future Perspectives
- Author
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Fulbright, J. W.
- Abstract
Author, Senator from Arkansas, discusses educational exchange since the enactment of Public Law 79-584, known as the Fulbright Law. (MB)
- Published
- 1972
47. How aggressive should initial therapy for rheumatoid arthritis be? Factors associated with response to ‘non-aggressive’ DMARD treatment and perspective from a 2-yr open label trial
- Author
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Matteson, E. L., Weyand, C. M., Fulbright, J. W., Christianson, T. J. H., McClelland, R. L., and Goronzy, J. J.
- Abstract
Objective. To determine what baseline factors might be associated with response to an initial mild treatment regimen in patients with early rheumatoid arthritis (RA).Methods. Open label 2-yr study of 111 consecutive patients with early RA of duration less than 1 yr. None of the patients had previously received disease-modifying anti-rheumatic drugs (DMARDs). All patients were assigned to receive hydroxychloroquine (HCQ) at enrolment, and could also take non-steroidal anti-inflammatory drugs (NSAIDs) and prednisone. At any point during follow-up, patients not fulfilling the American College of Rheumatology (ACR) 50 criteria for improvement and/or who were taking prednisone > 10 mg/day were considered treatment failures and therapy changed to methotrexate (MTX), 7.5–20 mg/week. Clinical, laboratory and immunogenetic factors potentially predictive of treatment assignment at month 24 were evaluated.Results. After 24 months of follow-up, a majority of patients (56/94) were either still on solo DMARD therapy with HCQ (n = 49) or off DMARD therapy with controlled/quiescent disease (n = 4), and 38 patients were taking MTX (including 11 in combination with other DMARDs). At month 24, all but 9 patients met ACR50 criteria for treatment response. Features present at enrolment which were predictors of MTX therapy at month 24 were high pain score, baseline rheumatoid factor titre > 1:40, higher number of swollen joints, and poor patient global assessment. The presence of HLA-C7xx at enrolment was also predictive of need for MTX therapy.Conclusions. This study suggests that even milder treatment with HCQ is greatly beneficial in patients with early RA. There continue to be very few consistently reliable predictors of treatment needs in patients with this disease.
- Published
- 2004
- Full Text
- View/download PDF
48. Discordant and anomalous results among cytotoxicity assays: the confounding properties of eosinophil granule major basic protein on cell viability assays
- Author
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Kubo, H., Loegering, D.A., Tohda, Y., Bankers-Fulbright, J., Weiler, C.R., Nakajima, H., Thomas, L.L., Adolphson, C.R., and Gleich, G.J.
- Published
- 1999
- Full Text
- View/download PDF
49. HLA-DRB1 Molecules and Antigenic Experience Shape the Repertoire of CD4 T Cells
- Author
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Walser-Kuntz, D. R., Weyand, C. M., Fulbright, J. W., Moore, S. Breanndan, and Goronzy, J. J.
- Published
- 1995
- Full Text
- View/download PDF
50. Functional properties of CD4^+ CD28^- T cells in the aging immune system
- Author
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Weyand, C. M., Brandes, J. C., Schmidt, D., Fulbright, J. W., and Goronzy, J. J.
- Published
- 1998
- Full Text
- View/download PDF
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