Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
D. Romano1 – F. Matteucci2, 1 – P. Ventura3 – 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 Abstract 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 an
