Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..862s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 862-865. Research supported by the Robert A. Welch
Astronomy and Astrophysics
Astrophysics
21
M Stars, Neutron Irradiation, Nuclear Fusion, S Stars, Abundance, Asymptotic Giant Branch Stars, Giant Stars, Milky Way Galaxy, Neutron Sources, Spectral Line Width
Scientific paper
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.
Lambert David L.
McWilliam Andrew
Smith Verne V.
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