Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-26
Astrophys.J.655:492-521,2007
Astronomy and Astrophysics
Astrophysics
73 pages, 14 tables, 13 figures, ApJ, in press
Scientific paper
10.1086/509817
The chemical compositions of 26 metal-poor stars that exhibit strong CH and/or C2 molecular bands are determined based on high-resolution spectroscopy. We define carbon-enhanced stars taking account of the carbon abundance ratio ([C/Fe]) and the evolutionary status. Twenty two stars in our sample satisfy our modified definition for Carbon-Enhanced Metal-Poor (CEMP) stars. In addition, we measure Na abundances for nine other carbon-enhanced stars for which abundances of other elements have been previously reported. Combining our new sample with the results of previous work, we investigate the abundance and evolutionary status of a total of 64 CEMP stars. In this paper, we separate the carbon-enhanced objects into Ba-rich and Ba-normal objects, and discuss on (1) the metallicity distributions, (2) the correlation between Ba and C (and C+N) abundances, (3) C abundance distributions, (3) the distributions of evolutionary status, and (5) Na abundances. The implications of these results on the origins of carbon in CEMP stars are discussed.
Aoki Wako
Beers Timothy C.
Christlieb Norbert
Norris John. E.
Ryan Sean G.
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