Abundances In Very Metal-Poor Dwarf Stars

We discuss the detailed composition of 28 extremely metal-poor (EMP) dwarfs, 22 of which are from the Hamburg/ESO Survey (HES), based on Keck echelle spectra. Our sample has a median [Fe/H] of-2.7 dex, extends to-3.5 dex, and is somewhat less metal-poor than was expected from [Fe/H](HK, HES) determi...

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Bibliographic Details
Published in:The Astrophysical journal 2004-09, Vol.612 (2), p.1107-1135
Main Authors: Cohen, Judith G, Christlieb, Norbert, McWilliam, Andrew, Shectman, Steve, Thompson, Ian, Wasserburg, G. J, Ivans, Inese, Dehn, Matthias, Karlsson, Torgny, Melendez, J
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Normal stars (by class): general or individual
Population ii stars (horizontal branch, metal poor, etc.)
Stars
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Summary:We discuss the detailed composition of 28 extremely metal-poor (EMP) dwarfs, 22 of which are from the Hamburg/ESO Survey (HES), based on Keck echelle spectra. Our sample has a median [Fe/H] of-2.7 dex, extends to-3.5 dex, and is somewhat less metal-poor than was expected from [Fe/H](HK, HES) determined from low-resolution spectra. Our analysis supports the existence of a sharp decline in the distribution of halo stars with metallicity below [Fe/H] =-3.0 dex. So far no additional turnoff stars with [Fe/H]
ISSN:0004-637X
1538-4357
DOI:10.1086/422576