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Sodium Enrichment in A--F Type Supergiants
Abstract
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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The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars
Karakas, A. I., & Lattanzio, J. C. (2014) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2014.21 · Cited by 735
“This agrees with El Eid & Champagne (1995) who find modest enhancements in low mass (0.1 dex) and intermediate mass (0.2–0.3 dex) stars.”
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Metadata
- Authors
- El Eid, M. F., & Champagne, A. E.
- ORCID
- Champagne, Arthur E.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1995-09
- Volume
- 451
- Pages
- 298
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2036440453
- Cited by
- 59
- References
- 0
- Citations by year
- 2024: 1 · 2020: 1 · 2019: 3 · 2018: 2 · 2016: 4 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 1
- FWCI
- 2.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Astrophysical Journal (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Nuclear physics research studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Gamma-ray bursts and supernovae
- Keywords
- sodium enrichment, nucleosynthesis, CNO cycle, dredge-up, stellar abundances, nuclear reaction rates
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