Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355...18r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, May 20, 1990, p. 18-28.
Astronomy and Astrophysics
Astrophysics
42
Big Bang Cosmology, Cosmochemistry, Lithium, Nuclear Fusion, Galactic Cosmic Rays, Nuclear Astrophysics, Stellar Composition, Stellar Physics
Scientific paper
It is argued that population II Li abundance is dominated by the contribution of big bang nucleosynthesis, with negligible contributions from early Galactic cosmic-ray and stellar processes. This conclusion supports the use of population II data for cosmological arguments. Including the possibility of surface depletion, the initial stellar values can be estimated to be (Li-7)/H = (2 + or - 0.5) x 10 to the -10th. Taking into account recent studies of the influence of the quark-hadron phase transition and the uncertainties attached to its parameter, big bang nucleosynthesis yields a range of baryonic density between 0.01 and 0.2. The uncertainties do not appear to be large enough to allow the baryons to close the universe. Li atoms are also generated by Galactic cosmic rays all along the galactic life. It seems that a third mechanism is needed which is most likely related to stellar processes. Arguments are presented in favor of the idea that Li is probably not mostly produced by the massive stars generally believed to generate oxygen.
Reeves Hubert
Richer Jaques
Sato Katsuhiko
Terasawa Nobuo
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