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The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars

Fabbian, Damian; Nissen, Poul E; Asplund, Martin; Pettini, Max; Akerman, Chris J


Aims. We present new measurements of the abundances of carbon and oxygen derived from high-excitation Ci and Oi absorption lines in metal-poor halo stars, with the aim of clarifying the main sources of these two elements in the early stages of the chemical enrichment of the Galaxy.Methods. We target 15 new stars compared to our previous study, with an emphasis on additional C/O determinations in the crucial metallicity range -3 ≲ [Fe/H]l ∼ -2. The stellar effective temperatures were estimated...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Astronomy and Astrophysics
DOI: 10.1051/0004-6361/200810095


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