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Multiple Stellar Populations in Galactic Globular Clusters : Updated empirical evidence and theoretical interpretations

Santi Cassisi (INAF)

In recent years accurate photometric and spectroscopic observations have provided sound evidence that Galactic Globular Clusters can not be longer considered the prototype of Simple Stellar Populations. In this talk we present the most recent updates concerning the empirical evidence and discuss the theoretical framework required for interpreting observations. Current shortcomings in the interpretation of how the multiple stellar populations formed in a given cluster are also discussed.