Sodium enrichment in A-F type supergiants
Journal Article (Journal Article)
We have investigated the nucleosynthesis of sodium (23Na) in stars of masses M = 5-19 M⊙ 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.
Full Text
Duke Authors
Cited Authors
- El Eid, MF; Champagne, AE
Published Date
- September 20, 1995
Published In
Volume / Issue
- 451 / 1
Start / End Page
- 298 - 307
Electronic International Standard Serial Number (EISSN)
- 1538-4357
International Standard Serial Number (ISSN)
- 0004-637X
Digital Object Identifier (DOI)
- 10.1086/176219
Citation Source
- Scopus