Evidence for Sub-Populations in Globular Clusters: Their Properties and Relationship with Cluster Properties
An increasing number of both photometric and spectroscopic observations over the last decade have shown the existence of distinct sub-populations in some Galactic globular clusters. This evidence severely challenges the paradigm of globular clusters as the prototypes of single, simple stellar populations. In this review, we briefly summarise the
Cassisi, Santi et al.
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