Carbon, nitrogen, and oxygen abundances in 11 G and K giants

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Carbon, G Stars, Giant Stars, K Stars, Late Stars, Nitrogen, Oxygen, Main Sequence Stars, Solar Atmosphere, Spectral Line Width, Stellar Atmospheres

Scientific paper

Carbon, nitrogen, and oxygen abundances have been determined for 11 G and K giants. High resolution photoelectric scans of C2, CH, CN, forbidden OI, and forbidden CI lines have been combined with recent model atmospheres. Relative to the solar atmosphere, the C abundances are depressed, the N abundances enhanced, and the O abundances unchanged. The observed CNO abundances and the previously obtained C-12/C-13 ratios are in good agreement with the predictions for a giant after the convective envelope has mixed material to the surface from the zone which was partially processed during the star's main-sequence lifetime.

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