Carbon and oxygen in the subgiant CH stars

Details Carbon and oxygen in the subgiant CH stars Carbon and oxygen in the subgiant CH stars

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..745s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Oct. 1983, p. 745-756.

Other

17

Abundance, Carbon Isotopes, Oxygen, Spectrum Analysis, Stellar Spectrophotometry, Subgiant Stars, High Resolution, Signal To Noise Ratios, Stellar Atmospheres, Stellar Evolution

Scientific paper

New high-resolution, high signal-to-noise ratio spectra of several subgiant CH stars have been analyzed for the abundances of carbon and oxygen and for the carbon isotope ratios. The carbon-to-oxygen ratio is less than or equal to unity in all stars. The C-12/C-13 isotope ratio is greater than 40 in most of the stars. The heavy element abundances are shown to be fairly consistent with results of other studies. The evolutionary state of the subgiant CH stars is discussed in light of these new abundance results.

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