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Title:
The chemical composition of red giants. II - Helium burning and the s-process in the MS and S stars
Authors:
Smith, Verne V.; Lambert, David L.
Affiliation:
AA(Texas, University; McDonald Observatory, Austin, TX), AB(Texas, University; McDonald Observatory, Austin, TX)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 843-863. Research supported by the Robert A. Welch Foundation. (ApJ Homepage)
Publication Date:
12/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Helium, M Stars, Nuclear Fusion, Red Giant Stars, S Stars, Stellar Composition, Atomic Spectra, Chemical Composition, Late Stars, Line Spectra, Stellar Evolution, Stellar Spectrophotometry
DOI:
10.1086/164823
Bibliographic Code:
1986ApJ...311..843S

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 alpha 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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