Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.2035v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 2035-2047. Research supported by Kennilworth Fund and Nati
Astronomy and Astrophysics
Astronomy
41
Asymptotic Giant Branch Stars, Binary Stars, Carbon Stars, Stellar Composition, Stellar Evolution, Stellar Mass Accretion, Abundance, Carbon Isotopes, K Stars, Peculiar Stars, Stellar Spectra
Scientific paper
Using the 1-0 C2 Swan band at 4737 A and the CN red system 2-0 band near 8000 A, the ratio of stable carbon isotopes, C-12/C-13, has been determined for eight CH giants. For a majority of the sample stars, the carbon isotope ratio is about 3 near the equilibrium value of the CN cycle, though there seems to be a second population of CH stars with high carbon isotope ratios. This range of ratios is the same as found for the Population II giants and globular cluster giant stars. Since the abundance anomalies which typify CH giants are believed to have originated by the transfer of mass from a now extinct AGB companion, the CH giant's atmosphere should be enhanced in triple alpha products from the AGB star's interior. The low carbon isotope ratios imply that the material transferred from the now unseen companion has been mixed into the CN burning region of the CH star or constitutes a minor fraction of the envelop mass of the CH star, thus giving isotope ratios typical of stars on their first ascent of the giant branch.
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