The s-process efficiency in massive stars

Details The s-process efficiency in massive stars The s-process efficiency in massive stars

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...354..740r&link_type=abstract

Astronomy and Astrophysics, v.354, p.740-748 (2000)

Astronomy and Astrophysics

Astrophysics

25

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Interiors, Galaxy: Abundances

Scientific paper

The s-process is studied in the He burning core of a M_alpha = 8 M_sun He star using temperature and density profiles obtained with a standard stellar evolution model and an updated nuclear network. We discuss in detail the s-process efficiency for metallicities Z/Z_sun ranging between 1 and 10-3 in the light of recent nuclear data. We show that \chem{16}{O} acts as a powerful neutron poison at low Z although its effect on the s-process yields is still subject to large uncertainties due to our imperfect knowledge of some nuclear reaction rates and of the galactic evolution of nuclei which determine the neutron economy of the s-process.

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