EDP Sciences
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Volume 374, Number 2, August I 2001
Page(s) 646 - 655
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010751

A&A 374, 646-655 (2001)
DOI: 10.1051/0004-6361:20010751

The stellar origin of $\mathsf{^7}$Li

Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
D. Romano1, F. Matteucci2, 1, P. Ventura3 and F. D'Antona3

1  International School for Advanced Studies, SISSA/ISAS, Via Beirut 2-4, 34014 Trieste, Italy
2  Dipartimento di Astronomia, Università di Trieste, Via G.B. Tiepolo 11, 34131 Trieste, Italy
3  Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monte Porzio Catone, Italy

(Received 22 December 2000 / Accepted 25 May 2001)

We adopt up-to-date 7Li yields from asymptotic giant branch stars in order to study the temporal evolution of 7Li in the solar neighbourhood in the context of a revised version of the two-infall model for the chemical evolution of our galaxy. We consider several lithium stellar sources besides the asymptotic giant branch stars such as type II supernovae, novae, low-mass giants as well as Galactic cosmic rays and low-mass X-ray binaries. We conclude that asymptotic giant branch stars cannot be considered as important 7Li producers as believed so far and that the contribution of low-mass giants and novae is necessary to reproduce the steep rise of the 7Li abundance in disk stars as well as the meteoritic 7Li abundance. Lithium production in low-mass X-ray binaries hardly affects the temporal evolution of 7Li in the solar neighbourhood.

Key words: galaxy: abundances -- galaxy: evolution -- galaxy: solar neighbourhood

Offprint request: D. Romano, romano@sissa.it

© ESO 2001

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