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Detection of solar-like oscillations from Kepler photometry of the open cluster NGC 6819
Dennis Stello, Sarbani Basu, Hans Bruntt +49
Asteroseismology of stars in clusters has been a long-sought goal because the assumption of a common age, distance and initial chemical composition allows strong tests of the theor…
The role of lithium production in massive AGB and super--AGB stars for the understanding of multiple populations in Globular Clusters
Paolo Ventura, Francesca D'Antona
Lithium is made up in the envelopes of massive Asymptotic Giant Branch (AGB) stars through the process of Hot Bottom Burning. In Globular Clusters, this processing is one possible…
A detailed study of the main sequence of the Globular Cluster NGC 6397: can we derive constraints on the existence of multiple population?
M. Di Criscienzo, F. D'Antona, P. Ventura
If NGC 6397 contains a large fraction of "second generation" stars (>70% according to recent analysis), the helium abundance of its stars might also be affected, show some star-to-…
The influence of the C+N+O abundances on the determination of the relative ages of Globular Clusters: the case of NGC 1851 and NGC 6121 (M4)
F. D'Antona, P. B. Stetson, P. Ventura +3
The color magnitude diagram (CMD) of NGC 1851 presents two subgiant branches (SGB), probably due the presence of two populations differing in total CNO content. We test the idea th…
The C+N+O abundances and the splitting of the subgiant branch in the Globular Cluster NGC 1851
P. Ventura, V. Caloi, F. D'Antona +3
Among the newly discovered features of multiple stellar populations in Globular Clusters, the cluster NGC 1851 harbours a double subgiant branch, that can be explained in terms of…
Massive AGB models of low metallicity: the implications for the self-enrichment scenario in metal poor Globular Clusters
Paolo Ventura, Francesca D'Antona
Context: We present the physical and chemical properties of intermediate-mass stars models of low metallicity, evolved along the thermal pulse phase. Aims: The target of this work…