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Spectroscopic studies of stellar populations in globular clusters and field stars: Implications for globular cluster and Milky Way halo formation

Published online by Cambridge University Press:  11 March 2020

Raffaele Gratton Open the ORCID record for Raffaele Gratton [Opens in a new window]
Raffaele Gratton*
Affiliation:
INAF-Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, 35122 Padova (Italy) email: raffaele.gratton@inaf.it
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Abstract

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We review spectroscopic results concerning multiple stellar populations in globular clusters. The cluster initial mass is the most important parameter determining the fraction of second generation stars. The threshold for the onset of the multiple population phenomenon is 1–3×105 M⊙. Nucleosynthesis is influenced by metallicity: Na/O and Mg/Al anti-correlations are more extended in metal-poor than in metal-rich clusters. Massive clusters are more complex systems than the smaller ones, with several populations characterized by different chemical compositions. The high Li abundance observed in the intermediate second generation stars strongly favours intermediate mass AGB stars as polluters for this class of stars; however, it is well possible that the polluters of extreme second generation stars, that often do not have measurable Li, may be fast rotating massive stars or super-massive stars. The mass budget factor should be a function of the cluster mass, and needs to be large only in massive clusters.

Keywords

Globular clustersLithiumNucleosynthesis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 241 - 250
Copyright
© International Astronomical Union 2020

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