Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..164a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 164-168.
Astronomy and Astrophysics
Astrophysics
57
Astronomical Models, Cosmology, Galactic Evolution, Lithium Isotopes, Abundance, Chemical Composition, Chemical Evolution, Galactic Cosmic Rays, Interstellar Matter, Novae, Red Giant Stars, Solar System, Stellar Mass, Stellar Temperature
Scientific paper
The galactic evolution of the lithium isotopes is investigated according to the recently observed Li abundances in halo stars and to the recently determined Li-7/Li-6 ratio in the interstellar medium: the primordial Li abundance might be ten times lower than this abundance in the Solar System; the Li-7/Li-6 ratio seems to have increased by factors greater than 2 between its Solar System value and the value observed in the interstellar medium. The basic parameters of this investigation are the stellar production of Li-7, the stellar destruction of Li-6 and Li-7 and the presence (or absence) of a low energy component in the galactic cosmic rays. In order to account for the observed abundances, a stellar production of Li-7 (either by novae or by red giants) should be effective. In any hypothesis considered here, the Li-7/Li-6 ratio cannot have increased by more than a factor 1.5 between the formation of the Solar System and now.
Audouze Jean
Boulade Olivier
Malinie Guy
Poilane Y.
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