Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters

Details Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters

2012-01-31

arxiv.org/abs/1201.6526v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

In press (The Astronomy and Astrophysics Review)

Scientific paper

Recent progress in studies of globular clusters has shown that they are not simple stellar populations, being rather made of multiple generations. Evidence stems both from photometry and spectroscopy. A new paradigm is then arising for the formation of massive star clusters, which includes several episodes of star formation. While this provides an explanation for several features of globular clusters, including the second parameter problem, it also opens new perspectives about the relation between globular clusters and the halo of our Galaxy, and by extension of all populations with a high specific frequency of globular clusters, such as, e.g., giant elliptical galaxies. We review progress in this area, focusing on the most recent studies. Several points remain to be properly understood, in particular those concerning the nature of the polluters producing the abundance pattern in the clusters and the typical timescale, the range of cluster masses where this phenomenon is active, and the relation between globular clusters and other satellites of our Galaxy.

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