Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-07-22
Astronomy and Astrophysics
Astrophysics
31 pages, latex, 15 ps figures, revised version, as acceped for publication by ApJ, all figures have been revised, qualitative
Scientific paper
10.1086/303665
The predictions of the abundances of D and \he3 from Big Bang Nucleosynthesis (BBN) and recent observations of these two isotopes suggest the need to develop new chemical evolution models. In particular, we examine the role of an early episode of massive star formation that would induce a strong destruction of D and a galactic wind. We discuss the ability of these models to match the observed local properties of the solar neighborhood such as the gas mass fraction, oxygen abundance, the age-metallicity relation, and the present-day mass function (PDMF). We also examine in detail the ability of the chemical evolution models discussed to reproduce the apparent lack of low mass, low metallicity stars in the solar neighborhood, namely the G-dwarf distribution. Indeed, we find models which satisfy the above constraints while at the same time allowing for a large primordial D/H ratio as is reportedly measured in some quasar absorption systems at high $z$, without the overproduction of heavy elements. The latter constraint is achieved by employing a simple dynamical model for a galactic wind.
Cass'e Michel
Olive Keith A.
Scully Sean
Vangioni-Flam Elisabeth
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