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The evolution of C and O abundances in stellar populations

Published online by Cambridge University Press:  06 January 2014

Poul E. Nissen  and
William J. Schuster
Poul E. Nissen
Affiliation:
Stellar Astrophysics Centre, Dept. of Physics and Astronomy, Aarhus University, Denmark email: pen@phys.au.dk
William J. Schuster
Affiliation:
Observatorio Astronomico National, UNAM, Ensenada, B.C.Mexico email: schuster@astrosen.unam.mx
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Abstract

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Carbon and oxygen abundances in F and G main-sequence stars ranging in metallicity from [Fe/H] = −1.6 to +0.5 are determined from a non-LTE analysis of C i and O i atomic lines in high-resolution spectra. Both C and O are good tracers of stellar populations; distinct trends of [C/Fe] and [O/Fe] as a function of [Fe/H] are found for high- and low-alpha halo stars and for thick- and thin-disk stars. These trends and that of [C/O] provide new information on the nucleosynthesis sites of carbon and the time-scale for the chemical enrichment of the various Galactic components.

Keywords

Stars: abundancesGalaxy: diskGalaxy: haloGalaxy: evolution

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