The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
A. P. Milone, G. Piotto, A. Renzini, A. F. Marino, L. R. Bedin, E., Vesperini, F. D'Antona, D. Nardiello, J. Anderson, I. R. King, D. Yong, A., Bellini, A. Aparicio, B. Barbuy, T. M. Brown, S. Cassisi, S. Ortolani, M., Salaris, A. Sarajedini, R. P. van der Marel

TL;DR
This study uses high-precision HST photometry to identify and analyze multiple stellar populations in 57 Galactic globular clusters, revealing correlations between population complexity, cluster mass, and chemical compositions.
Contribution
It provides a comprehensive atlas of multiple stellar populations in GCs using chromosome maps, highlighting the relation between population fractions, cluster mass, and chemical properties.
Findings
Most GCs show two distinct populations (1G and 2G) with different chemical signatures.
The fraction of 1G stars decreases with increasing cluster mass.
Some clusters exhibit more complex populations with multiple sequences and chemical variations.
Abstract
We use high-precision photometry of red-giant-branch (RGB) stars in 57 Galactic globular clusters (GCs), mostly from the `Hubble Space Telescope (HST) UV Legacy Survey of Galactic globular clusters', to identify and characterize their multiple stellar populations. For each cluster the pseudo two-color diagram (or `chromosome map') is presented, built with a suitable combination of stellar magnitudes in the F275W, F336W, F438W and F814W filters that maximizes the separation between multiple populations. In the chromosome map of most GCs (Type I clusters), stars separate in two distinct groups that we identify with the first (1G) and the second generation (2G). This identification is further supported by noticing that 1G stars have primordial (oxygen-rich, sodium-poor) chemical composition, whereas 2G stars are enhanced in sodium and depleted in oxygen. This 1G-2G separation is not…
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