Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars

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dc.creatorAoki, Wako
dc.creatorBeers, Timothy C.
dc.creatorChristlieb, Norbert
dc.creatorNorris, John E.
dc.creatorRyan, Sean G.
dc.creatorTsangarides, Stelios
dc.date2006-09-26
dc.date.accessioned2026-07-07T10:40:15Z
dc.date.available2026-07-07T10:40:15Z
dc.descriptionThe 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.
dc.description73 pages, 14 tables, 13 figures, ApJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0609702
dc.identifierhttp://arxiv.org/abs/astro-ph/0609702
dc.identifierAstrophys.J.655:492-521,2007
dc.identifierdoi:10.1086/509817
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181286
dc.subjectAstrophysics
dc.titleCarbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
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