Sodium Enrichment in A--F Type Supergiants

Details Sodium Enrichment in A--F Type Supergiants Sodium Enrichment in A--F Type Supergiants

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..298e&link_type=abstract

Astrophysical Journal v.451, p.298

Astronomy and Astrophysics

Astronomy

51

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Evolution, Stars: Interiors

Scientific paper

We have investigated the nucleosynthesis of sodium (23Na) in stars of masses M = 5-19 Msun having solar-like initial chemical composition. The values obtained for the Na excess after the first dredge-up phase are in close agreement with recent observations suggesting a moderate Na excess in F-type supergiants. We also found a positive correlation between the overabundance factors [N/H] and [Na/H] which seems to indicate that Na enrichment originates from the Ne-Na cycle operating simultaneously with the CNO tri-cycle in these stars. We emphasize that our results were obtained on the basis of standard physical assumptions in the stellar model calculations, but with updated reaction rates for the reactions involved in the Ne-Na cycle which are presented in this work.

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