Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...518l..91r&link_type=abstract
The Astrophysical Journal, Volume 518, Issue 2, pp. L91-L94.
Astronomy and Astrophysics
Astronomy
37
Galaxy: Abundances, Galaxy: Evolution, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Agb And Post-Agb
Scientific paper
We present numerical simulations of the Galactic chemical evolution performed by means of an N-body/smooth particle hydrodynamics code. The Galactic enrichment of barium is studied by taking into account nucleosynthesis contributions from both low-mass Type II supernovae (SNIIs), via a primary r-process, and low-mass asymptotic giant branch (AGB) stars, through a metal-dependent s-process. Recent calculations of neutron captures in stars of 1.5-3 M_solar and different metallicities provide the Ba yields from the AGB stars; the Ba yields from SNIIs are derived from considerations about the solar system composition. Our simulations show that these two Ba sources can explain both the [Ba/Fe] versus [Fe/H] behavior as derived from high-resolution spectroscopic observations of F-K giants, including the large spread of [Ba/Fe] observed at low metallicities, and the ratio between the r- and s-process contributions to solar barium.
Busso Maurizio
Cravanzola A.
Gallino Roberto
Raiteri Claudia M.
Villata Massimo
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