Carbon abundances and isotope ratios in 70 bright M giants

Details Carbon abundances and isotope ratios in 70 bright M giants Carbon abundances and isotope ratios in 70 bright M giants

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249...62l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 62-68.

Astronomy and Astrophysics

Astronomy

16

Abundance, Carbon Isotopes, Giant Stars, M Stars, Stellar Spectrophotometry, G Stars, K Stars, Stellar Atmospheres, Stellar Models, Stellar Spectra

Scientific paper

Approximate carbon abundances and C-12/C-13 isotope ratios are obtained for 70 M giant stars from intermediate-resolution spectrophotometry of the CO bands near 2.3 microns. A low mean carbon abundance (C/H = -0.64 + or - 0.29) is obtained, suggesting that standard mixing is insufficient to explain atmospheric abundances in M giants. HR 8795 appears to be exceptionally carbon deficient, and is worthy of further study as a possible weak G-band star descendant.

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