Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..523s&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 523-526.
Astronomy and Astrophysics
Astrophysics
20
Abundance, Carbon Isotopes, G Stars, Giant Stars, K Stars, Late Stars, Stellar Evolution, Stellar Mass, Carbon 12, Carbon 13, Red Giant Stars
Scientific paper
Some proposed explanations for the anomalously low C-12/C-13 ratios in G-K giants require initial main-sequence masses greater than some value M. The fraction of red giants which have initial masses greater than M is calculated theoretically as a function of M using self-consistent initial mass functions, birthrates, and stellar lifetimes. This fraction is compared with the actual fraction of G-K giants with anomalous C-12/C-13 ratios, derived from the observed distribution of C-12/C-13 ratios after corrections for selection effects. It is found that M must be less than around 1.5 solar masses in order to explain the observed number of anomalous stars. This constraint rules out meridional mixing or rapid mass loss on the main sequence as possible explanations for the low C-12/C-13 ratios. Shear instability in the core-envelope interface region and the He core flash appear to be the most promising alternatives.
Miller Emily G.
Scalo John M.
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