Theoretical surface abundances of Population I giants

Details Theoretical surface abundances of Population I giants Theoretical surface abundances of Population I giants

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..493s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, Aug. 1980, p. 493-502. Research supported by the National Research

Other

9

Abundance, Giant Stars, Stellar Evolution, Stellar Mass Ejection, Stellar Models, Surface Properties, Algorithms, Carbon 12, Carbon 13, Main Sequence Stars, Nitrogen Isotopes, Oxygen Isotopes, Stellar Luminosity

Scientific paper

The paper discusses the abundance predictions of standard models of stellar evolution which do not agree with the observed CNO and other abundance ratios in all giants. The effects of variation of initial composition and mass loss on the abundance ratios of C-12/C-13, C-12/N-14, C-16/C-12, Li-7/H, and Be-9/H in giants are considered. To test these effects, stellar models of 1.0, 1.5, and 2.5 solar mass are evolved with and without mass loss from the zero age main sequence to the giant branch; mass loss is treated applying a scaled Reimers' mass loss algorithm and an acoustic luminosity algorithm. The anomalous abundances in giants could be explained by sufficient mass loss if it is present before the giant branch and/or variation of initial composition.

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