The stellar origin of Li
Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
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
Corresponding author: D. Romano, firstname.lastname@example.org
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
© ESO, 2001