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Stellar and GCR Production of Lithium in the Milky Way

Published online by Cambridge University Press:  25 May 2016

F. Matteucci  and
D. Romano
F. Matteucci
Affiliation:
Department of Astronomy, University of Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy
D. Romano
Affiliation:
SISSA/ISAS, Via Beirut, 2-4, I-34014 Trieste, Italy

Abstract

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Lithium production from several stellar sources (C-stars, massive AGB stars, Type II supernovae and novae) as well as from galactic cosmic rays (GCR) is included in a succesfull model for the chemical evolution of the Milky Way in order to predict the evolution of the 7Li abundance (A(Li) = log(7Li/H) + 12) as a function of [Fe/H]. From comparison with the oservational data we infer the following conclusions: 1) Li production from novae seems to be necessary to explain the steep rise of the Li abundance for metallicities larger than [Fe/H] = — 1.0 dex, 2) Li production from SNe II should be less than assumed before in order to reproduce the long plateau observed for A(Li) for low metallicities, 3) Li production from C-stars is negligible relative to Li production from massive AGB stars which is instead a necessary Li- source, 4) Li production from GCR should contribute by no more than 20% to the solar Li abundance.

Type
7. Evolution of the Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 558 - 562
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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