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Elemental abundances of metal poor carbon rich lead star: CS29497-030
T. Sivarani, P. Bonifacio, P. Molaro +12
We present here the abundance analysis of a metal poor carbon rich lead star, CS29497-030. High resolution and high signal to noise spectra were obtained using the UVES spectrograp…
Measurement of the Europium Isotope Ratio for the Extremely Metal-Poor, r-Process-Enhanced Star CS31082-001
W. Aoki, S. Honda, T. C. Beers +1
We report the first measurement of the isotope fraction of europium (151Eu and 153Eu) for the extremely metal-poor, r-process-enhanced star CS31082-001, based on high-resolution sp…
A stellar relic from the early Milky Way
Norbert Christlieb, Michael S. Bessell, Timothy C. Beers +6
The chemical composition of the most metal-deficient stars reflects the composition of the gas from which they formed. These old stars provide crucial clues to the star formation h…
Stellar Archaeology: a Keck Pilot Program on Extremely Metal- Poor Stars From the Hamburg/ESO Survey. III. The Lead (Pb) Star HE 0024-2523
Sara Lucatello, Raffaele Gratton, Judith G. Cohen +4
We present a detailed abundance analysis, including spectral syntheses, of a very metal-poor ([Fe/H]= -2.7), peculiar main sequence star, HE0024-2523 detected during the course of…
The Mass of the Milky Way: Limits from a Newly Assembled Set of Halo Objects
Tsuyoshi Sakamoto, Masashi Chiba, Timothy C. Beers
We set new limits on the mass of the Milky Way, making use of the latest kinematic information for Galactic satellites and halo objects. In order to bind these sample objects to th…
A Subaru/HDS study of Lead (Pb) abundances in eight s-process-element-rich, metal-poor stars
W. Aoki, S. G. Ryan, J. E. Norris +2
We report the abundances of neutron-capture elements in eight carbon-rich, metal-poor (-2.7=<[Fe/H]=<-1.9) stars observed with the Subaru Telescope High Dispersion Spectrograph. Th…
Chemical Composition of the Carbon-rich, Extremely Metal-Poor Star CS 29498--043: A New Class of Extremely Metal-Poor Stars with Excesses of Magnesium and Silicon
W. Aoki, J. E. Norris, S. G. Ryan +2
We analyze a high-resolution, high signal-to-noise spectrum of the carbon-rich, extremely metal-poor star CS29498-043, obtained with the Subaru Telescope High Dispersion Spectrogra…
The r-process in the neutrino winds of core-collapse supernovae and U-Th cosmochronology
Shinya Wanajo, Naoki Itoh, Yuhri Ishimaru +2
The discovery of the second highly -process-enhanced, extremely metal-poor star, CS 31082-001 ([Fe/H] ) has provided a powerful new tool for age determination, by virtue…
First Stars II. Elemental abundances in the extremely metal-poor star CS 22949--037: A diagnostic of early massive supernovae
E. Depagne, V. Hill, M. Spite +10
CS 22949--037 is one of the most metal-poor giants known ([Fe/H]), and it exhibits large overabundances of carbon and nitrogen (Norris et al.). Using VLT-UVES spectra…
Metal Abundances and Kinematics of Bright Metal-Poor Giants Selected from the LSE Survey: Implications for the Metal-Weak Thick Disk
Timothy C. Beers, John S. Drilling, Silvia Rossi +5
We report medium-resolution (1-2 A) spectroscopy and broadband (UBV) photometry for a sample of 39 bright stars (the majority of which are likely to be giants) selected as metal-de…
Stellar Archaeology: a Keck Pilot Program on Extremely Metal-Poor Stars from the Hamburg/ESO Survey. II. Abundance Analysis
Eugenio Carretta, Raffaele Gratton, Judith G. Cohen +2
We present a detailed abundance analysis of 8 stars selected as extremely metal poor candidates from the Hamburg/ESO Survey (HES). For comparison, we have also analysed 3 extremely…
Stellar Archaeology: a Keck Pilot Program on Extremely Metal-Poor Stars From the Hamburg/ESO Survey. I Stellar Parameters
Judith G. Cohen, Norbert Christlieb, Timothy C. Beers +2
In this series of two papers we present a high dispersion spectroscopic analysis of 8 candidate extremely metal poor stars selected from the Hamburg/ESO Survey and of 6 additional…
The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
V. Hill, B. Plez, R. Cayrel +10
We present a high-resolution spectroscopic analysis of the bright (V=11.7), extreme halo giant CS31082-001 ([Fe/H] = -2.9), obtained in an ESO-VLT Large Programme dedicated to very…
The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248
John J. Cowan, Christopher Sneden, Scott Burles +8
We have combined new high-resolution spectra obtained with the Hubble Space Telescope (HST) and ground-based facilities to make a comprehensive new abundance analysis of the metal-…
Rapid rotation of ultra-Li-depleted halo stars and their association with blue stragglers
Sean G. Ryan, Scott G. Gregory, Ulrich Kolb +2
Observations of eighteen halo main-sequence-turnoff stars, four of which are extremely deficient in Li, show that three of the Li-poor ones have substantial line broadening. We att…
Europium Isotopic Abundances in Very Metal-poor Stars
Christopher Sneden, John J. Cowan, James E. Lawler +3
Europium isotopic abundance fractions are reported for the very metal-poor, neutron-capture-rich giant stars CS 22892-052, HD 115444, and BD +17 3248. The abundance fractions, deri…