The early nucleosynthesis of O and Fe

Details The early nucleosynthesis of O and Fe The early nucleosynthesis of O and Fe

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170..361a&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

1

Dwarf Stars, Halos, Hydrogen, Iron, Nuclear Fusion, Oxygen, Stellar Evolution, Stellar Models, Gravitational Waves, Light Curve, Milky Way Galaxy, Star Formation, Stellar Mass Ejection, Supernovae, White Dwarf Stars, Wolf-Rayet Stars

Scientific paper

The new observational O/Fe vs Fe/H relationship in halo dwarfs is analyzed in terms of a model of chemical evolution for the solar neighborhood. The role of nucleosynthesis prescriptions for SN II and SN I (both Ia and Ib) is analyzed. It is shown that, by adopting iron yields for SN II according to the observations of SN 1987A and by assuming double degenerate systems to be the progenitors of SN Ia and Wolf-Rayet stars to be the progenitors of SN Ib, it is possible to reproduce quite well the behavior of the O/Fe ratio for halo and disk stars. Nevertheless, best agreement is obtained when introducing in addition a variable IMF during the halo evolution.

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