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Lithium Abundances and Other Clues to Envelope Burning in Small Magellanic Cloud Asymptotic Giant Branch Stars
Abstract
We present a chemical analysis of seven luminous asymptotic giant branch stars and one M supergiant of the Small Magellanic Cloud. The abundances are derived from high-resolution spectra by spectrum synthesis using new, spherically symmetric, opacity sampling model atmospheres. The average metallicity is [Fe/H] = -0.5, in accordance with other determinations of the SMC's metallicity. The AGB stars show signs of envelope burning, being Li rich, C poor, and with a low 12C/13C ratio. The s-process elements (Rb, Zr, Nd) abundance pattern is different from that in the solar system, and is characteristic of a high exposure at low neutron density. This is not peculiar to the SMC, however, but seems to be an effect of metallicity: Galactic Ba, CH, and S-type stars at the same metallicity display similar s-process element abundance patterns. Apparently, the 13C neutron source is operating in these intermediate-mass thermally pulsing AGB stars.
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HBB was actually occurring in intermediate-mass AGB stars.
“gave further credibility to the idea that HBBwasactuallyoccurring in intermediate-mass AGB stars.”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Plez et al. 1993
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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
“The discovery that the brightest AGB stars are rich in Li (Smith & Lambert 1989, 1990a; Plez et al. 1993; Garćıa-Hernández et al. 2013) gave further credibility to the idea that HBB was actually occurring in intermediate-mass AGB stars.”
BackgroundStellar Models and Yields of Asymptotic Giant Branch Stars
Karakas, A., & Lattanzio, J. C. (2007) · Publications of the Astronomical Society of Australia · doi:10.1071/as07021 · Cited by 312
Metadata
- Authors
- Plez, B., Smith, V. V., & Lambert, D. L.
- Affiliations
- The University of Texas at Austin (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1993-12
- Volume
- 418
- Pages
- 812
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2091839925
- Cited by
- 132
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 3 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 3 · 2012: 2
- FWCI
- 3.60
- 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 › Instrumentation › Astronomy and Astrophysical Research
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Keywords
- lithium abundance, asymptotic giant branch stars, Small Magellanic Cloud, carbon deficiency, 13C/12C ratio, s-process nucleosynthesis, neutron exposure, model atmospheres, metallicity, thermally pulsing AGB stars, M supergiants
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