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Over the last decade, the classical definition of Globular Clusters (GCs) assimple stellar populations was revolutionized due to the discovery of "MultiplePopulations" (MPs). However, our knowledge of this phenomenon and itscharacteristics is still lacking greatly observationally, and there iscurrently no scenario that adequately explains its origin. It is thereforeimportant to study as many GCs as possible to characterize whether or not theyhave MPs, and determine their detailed behavior to enlighten formationscenarios, using a wide range of techniques. The Washington photometric systemhas proved to be useful to find MPs thanks mainly to the UV-sensitivity andhigh efficiency of the C filter. We search for MPs in the Galactic GC NGC 7099(M30), the second GC being searched for MPs using this system. We obtainedphotometric data using the Swope 1m telescope at Las Campanas Observatory, aswell as the 4m SOAR facility. Our reduction procedure included addstarexperiments to properly assess photometric errors. We find a clear signal ofMPs based on an intrinsically wide color spread on the RGB, in particular dueto a relatively small fraction of stars significantly bluer than the main RGBlocus. These stars should correspond to so-called first generation stars, whichwe estimate to be roughly 15\% of the total. However, we find thesefirst-generation stars to be more spatially concentrated than their secondgeneration counterparts, which is the opposite to the general trend found inother clusters. We briefly discuss possible explanations for this phenomenon.

Uncovering Multiple Populations in NGC 7099 (M 30) using Washington Photometry