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The chemical composition of red giants. II - Helium burning and the s-process in the MS and S stars
Abstract
Carbon, nitrogen, oxygen, Fe-peak, and heavy s-process elemental abundances have been determined for an additional 12 stars of type M, MS, or S. When combined with results obtained previously for nine stars of type M or MS and the K5 giant α Tau, abundances are available for 22 cool red giants. Mg-isotopic ratios and technetium abundances are estimated for selected stars. Of the 22 stars studied, eight are of type MS and three of type S. Four of the MS stars show no measurable enhancements of the s-process elements. The seven stars which exhibit s-process enhancements also show increasing 12C abundances and the 12C abundances correlate with both absolute s-process enhancement and integrated neutron exposure. The results for the s-process and 12C-rich stars are compared to theoretical models of low-mass (1 - 2 M_sun;), thermally pulsing AGB stars.
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Many C stars have surface enrichments of heavy elements synthesised by the s-process (e.g., Zr, Y, Sr, Ba, Tc).
“Many C stars also have surface enrichments of heavy elements synthesised by the s -process (e.g., Zr, Y, Sr, Ba, Tc; Smith & Lambert 1986; Smith, Lambert, & McWilliam 1987; Smith & Lambert 1990b; Abia et al. 2002).”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Smith & Lambert 1986
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The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
Majewski, S. R., Schiavon, R. P., Frinchaboy, P. M., Prieto, C. A., Barkhouser, R., Bizyaev, D., Blank, B., Brunner, S., Burton, A., Carrera, R., et al. (2017) · The Astronomical Journal · doi:10.3847/1538-3881/aa784d · Cited by 1,831
Self-citationThe 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
“Observations come from stars with spectral types M, S, SC, C(N), post-AGB stars and planetary PASA (2014) doi:10.1017/pas.2014.xxx nebulae (Smith & Lambert 1986; Vanture et al. 1991; Abia et al. 2001, 2002, 2008; Van Winckel & Reyniers 2000; Reyniers et al. 2007; Sterling & Dinerstein 2008; van…”
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Metadata
- Authors
- Smith, V. V., & Lambert, D. L.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1986-12
- Volume
- 311
- Pages
- 843
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2045158898
- Cited by
- 204
- References
- 0
- Citations by year
- 2026: 4 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 7 · 2017: 6 · 2016: 7 · 2015: 4 · 2014: 6 · 2013: 1 · 2012: 8
- FWCI
- 12.12
- 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
- red giants, chemical abundances, s-process nucleosynthesis, helium burning, M giants, S stars, neutron exposure, technetium, Fe-peak elements, thermally pulsing AGB stars
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