Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-08
Astron.Astrophys.352:117,1999
Astronomy and Astrophysics
Astrophysics
23 pages, LaTeX, 8 figures, accepted for publication in Astronomy and Astrophysics (Main Journal)
Scientific paper
The evolution of the 7Li abundance in the Galaxy has been computed by taking into account several 7Li sources: novae, massive AGB stars, C-stars, Type II SNe and GCRs. The theoretical predictions for the evolution of the 7Li abundance in the solar neighborhood have been compared to a new compilation of data. A critical analysis of extant observations revealed a possible extension of the Li plateau towards higher metallicities (up to [Fe/H] = -0.5 or even -0.3) with a steep rise afterwards. We conclude that 1) the 7Li contribution from novae is required in order to reproduce the shape of the growth of A(Li) versus [Fe/H], 2) the contribution from Type II SNe should be lowered by at least a factor of two, and 3) the 7Li production from GCRs is probably more important than previously estimated, in particular at the highest metallicities.
Bonifacio Piercarlo
Matteucci Francesca
Molaro Paolo P.
Romano Donatella
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