Giampaolo Piotto
Published 2009-02-09Version 1
An increasing number of photometric observations of multiple stellar populations in Galactic globular clusters is seriously challenging the paradigm of GCs hosting single, simple stellar populations. These multiple populations manifest themselves in a split of different evolutionary sequences as observed in the cluster color-magnitude diagrams. Multiple stellar populations have been identified in Galactic and Magellanic Cloud clusters. In this paper we will summarize the observational scenario.
Comments: to appear in the proceedings of "the Ages of Stars" Batimore, 13-17 Oct 2008 IAU Symposium No 258, 2009
Multiple stellar populations at less evolved stages-II: no evidence of significant helium spread among NGC 1846 dwarfs
Multiple stellar populations in Magellanic Cloud clusters. II. Evidence also in the young NGC1844?
Multiple stellar populations in Magellanic Cloud clusters. IV. The double main sequence of the young cluster NGC1755
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