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Accueil > Séminaires > Séminaires passés > Seminaires de 2012 > M. Lugaro (Monash University, Australia)

Production of short-lived radioactive nuclei in Super-asymptotic giant branch stars and its relevance to the formation of the Solar System

M. Lugaro (Monash University, Australia)

Lundi 29 octobre 2012, 16h en salle du conseil à L’IPN

Stars with initial mass in the range 7-11 solar masses, the exact values depending on nuclear and stellar mixing uncertainties, evolve through core H, He, and C burning and the "Super"-asymptotic giant branch (Super-AGB) phase. They represent a significant fraction of stars in OB associations and have relatively short lives of 30 Myr, which may result in the presence of Super-AGB stars in the environment where the Sun was born. I will show that Super-AGB stars could be responsible for the production of some of the short-lived radionuclides present in the early Solar System. These stars can produce the canonical value of the 26Al27Al ratio in the early Solar System with small associated changes in the O composition. The meteoritic abundances of 41Ca and 60Fe can also be matched by the models, depending on the nuclear and stellar physics uncertainties as well as the meteoritic experimental data. Moreover, we expect and are currently investigating Super-AGB production of short-lived radionuclides heavier than Fe, such as 107Pd and 182Hf.