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Lithium and Barium abundances in globular clusters: hints on first generation stars

Valentina D'Orazi

The traditional perspective of globular clusters as simple stellar populations is now overcome. In the last years a lot of observational studies (both spectroscopic and photometric) have revealed the presence of chemical anti-correlation between C,O, Mg and N, Na, and Al, respectively, pointing out to pollution processes and to the existence of multiple stellar generations. In this talk I will illustrate our results on determination of lithium and barium abundances in a large sample of globular cluster stars and their relation with proton-capture elements.
General implications on cluster formation and early evolution scenarios will be also discussed.

2010 September 29, 11:00

Centro de AstrofÝsica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Instituto de Astrof├şsica e Ci├¬ncias do Espa├žo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda├ž├úo para a Ci├¬ncia e a Tecnologia