Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..251s&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 251-266. Research supported by the Alfred P. Sloan Foundation
Astronomy and Astrophysics
Astrophysics
39
Abundance, Giant Stars, Stellar Evolution, Stellar Models, Stellar Structure, Technetium Isotopes, Computerized Simulation, Hertzsprung-Russell Diagram, Mass Transfer, Mixing, Star Distribution, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra
Scientific paper
Recent observations of technetium line strengths in cool giants by Little-Marenin and Little (1979) are used to shed some light on theoretical problems which require investigation. It is shown that the presence of Tc in red giants, particularly M giants, provides a unique discriminant of evolutionary mixing models. The approach used in the reported study involves computed simulations of the evolution of a large sample of stars. The considered population simulation technique is applied to double-shell phase models. It is assumed that Tc is mixed to the surface during consecutive helium shell flashes. Attention is given to the conditions for the beginning of mixing which are required for the reproduction of the fraction of M giants which exhibit Tc lines.
Miller Emily G.
Scalo John M.
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