Carbon, nitrogen, and oxygen abundances in G8-K3 giant stars

Details Carbon, nitrogen, and oxygen abundances in G8-K3 giant stars Carbon, nitrogen, and oxygen abundances in G8-K3 giant stars

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..145k&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 145-163. Research supported by the Statens Naturvidenskabelige Forsk

Astronomy and Astrophysics

Astrophysics

101

Abundance, Carbon, Giant Stars, Nitrogen, Oxygen Spectra, Stellar Atmospheres, Errors, Nuclear Fusion, Stellar Evolution, Stellar Spectra, Stellar Temperature

Scientific paper

High-resolution scans of the forbidden O I 6300 line and of lines of the red CN(2, 0) band, and very-narrow-band-index measurements of the C2 Swan (0, 1) band head have been obtained for approximately 30 G8-K3 III stars; and CNO abundances have been derived from these data. The errors in the resulting CNO abundances are typically 0.1-0.2 dex for C/H and O/H, and 0.2-0.3 dex for N/H. The abundance results verify the general result of Lambert and Ries that there seem to exist a nitrogen enrichment and a carbon deficiency in most giants as compared with main-sequence stars. The C/N ratio is shown to be significantly smaller for the giants than for the sun, with the exception of Intermediate Population II stars. The O/Fe ratio is shown to be greater than that of the sun for the metal-poor stars, while it is close to solar for the rest of the sample. These tendencies are considered as possible consequences of stellar and galactic evolution.

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