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

Abstract

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.

arXiv comment10 pages, 5 figures. To appear in: "Star Clusters: From the Milky Way to the Early Universe", Proceedings IAU Symposium No. 351, 2019, A. Bragaglia, M.B. Davies, A. Sills & E. Vesperini, eds

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