Thirteen facts that you need to know on multiple populations in globular clusters

A. P. Milone

Published 2019-08-30Version 1

I review the methods, mostly developed in the last decade, that are commonly used to identify and characterize multiple populations (MPs) in Globular Clusters based on photometry. I summarize the results from the recent surveys of MPs with the Hubble Space Telescope and ground-based facilities and provide a list of the main properties of MPs as inferred from these studies.