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Observational evidence for a different IMF in the early Galaxy
Sara Lucatello, Raffaele G. Gratton, Timothy C. Beers +1
The unexpected high incidence of carbon-enhanced, s-process enriched unevolved stars amongst extremely metal-poor stars in the halo provides a significant constraint on the Initial…
The Binary Frequency Among Carbon-Enhanced, s-Process Rich, Metal-Poor Stars
Sara Lucatello, Stelios Tsangarides, Timothy C. Beers +3
We discuss radial velocities for a sample of carbon-enhanced, s-process rich, very metal-poor stars (CEMP-s hereafter), analyzed with high-resolution spectroscopy obtained over mul…
Where Are We Now, and Where Are We Going? Perspectives on Cosmic Abundances
Timothy C. Beers
I was asked at the end of this conference to provide a few comments on the present status of the field of cosmic abundances, which I summarize (and extend upon) in this contributio…
The stellar content of the Hamburg/ESO survey. III. Field horizontal-branch stars in the Galaxy
N. Christlieb, T. C. Beers, C. Thom +5
We present a sample of 8321 candidate Field Horizontal-Branch (FHB) stars selected by automatic spectral classification in the digital data base of the Hamburg/ESO objective-prism…
Lead abundance in the uranium star CS 31082-001
B. Plez, V. Hill, R. Cayrel +6
In a previous paper we were able to measure the abundance of uranium and thorium in the very-metal poor halo giant BPS CS 31082-001, but only obtained an upper limit for the abunda…
First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
M. Spite, R. Cayrel, B. Plez +11
We have investigated the poorly-understood origin of nitrogen in the early Galaxy by determining N abundances in 35 extremely metal-poor halo giants (22 stars have [Fe/H]<-3.0) usi…