Neutron-exposure variations in MS and S stars, and the implications for s-process nucleosynthesis
Abstract
High-resolution, near-infrared spectra have been obtained for 34 stars of types MS and S along with 14 M giants used as comparison stars. Equivalent width measurements of spectral lines arising from the heavy s-process species La II and Nd II, relative to the lighter s-process species Y II, indicate a large range of neutron exposures in the MS and S stars. The indicated range of mean neutron exposures is approximately τ0 ≈ 0.1 - 0.6 mb-1. The solar system s-process distribution is characterized by τ0 = 0.26 mb-1.The overall enhancement of s-process elements observed in the MS and S stars indicates that they are substantial contributors to the Galactic production of s-process nuclei.
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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, & McWilliam 1987
Phosphorus and Sc can also be produced in small quantities by AGB stars as a consequence of neutron captures in the He intershell.
“Phosphorus and Sc can also be produced in small quantities by AGB stars as a consequence of neutron captures in the He intershell (Smith et al. 1987; Karakas et al. 2012).”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Smith et al. 1987
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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 · see citing works
“…stars and SNe and concluded that AGB stars (or some other source, such as Wolf Rayet stars) need to produce more 25Mg and 26Mg. Phosphorus and Sc can also be produced in small quantities by AGB stars as a consequence of neutron captures in the He intershell (Smith et al. 1987; Karakas et al. 2012).”
Background
- Authors
- Smith, V. V., Lambert, D. L., & McWilliam, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1987-09
- Volume
- 320
- Pages
- 862
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2034916193
- Cited by
- 16
- References
- 0
- Citations by year
- 2023: 1 · 2014: 1 · 2013: 1
- FWCI
- 0.00
- 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
- neutron exposure, s-process nucleosynthesis, S stars, M giants, lanthanum, neodymium, yttrium, galactic chemical evolution, neutron capture
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