Galactic Evolution and the Formation of the Light Elements
1974; IOP Publishing; Volume: 192; Linguagem: Inglês
10.1086/153081
ISSN1538-4357
Autores Tópico(s)Gamma-ray bursts and supernovae
Resumoview Abstract Citations (92) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galactic Evolution and the Formation of the Light Elements Audouze, Jean ; Tinsley, Beatrice M. Abstract Evolution of the abundances of the light elements (A < 11) is considered in the framework of current theories concerning their origin and alternative models for galactic evolution in the solar neighborhood. Results most consistent with observed abundances are obtained using galactic models in which most of the interstellar gas is processed through stars at early times, and in which there is an inflow of extragalactic gas at a rate comparable to the present stellar birthrate. These features are valuable in accounting, in particular, for the relative abundances of 9Be and 6Li, the possible dependence of Be abundance on stellar age, and the solar-system D abundance. In the framework of evolutionary models, D and 3He may be produced either in the big bang or, less probably, during galactic evolution. The relative solar-system abundances of 6Li, 9Be, `0B, and 11B are readily accounted for by spallation of the interstellar gas by galactic cosmic rays, while most of the 7Li might be produced by suprathermal particles ( 10 MeV per nucleon) either in supernova envelopes or in their vicinity. The effects of various uncertainties on these conclusions are studied, including the rate of destruction of the light elements in stellar envelopes, and the cosmic abundance of boron. Subject headings: abundances - interstellar matter - nucleosynthesis - stellar evolution Publication: The Astrophysical Journal Pub Date: September 1974 DOI: 10.1086/153081 Bibcode: 1974ApJ...192..487A full text sources ADS |
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