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The HST UV Survey of Globular Clusters (GCs) has investigated GCs and theirstellar populations. In previous papers of this series we have introduced apseudo two-color diagram, "chromosome map" (ChM), that maximises the separationbetween the multiple populations. We have identified two main classes of GCs:Type I (~83% of the objects) and Type II, both hosting two main groups ofstars, referred to in this series as first (1G) and second generation (2G).Type II clusters exhibit two or more parallel sequences of 1G and 2G stars intheir ChMs. We exploit elemental abundances from literature to assign thechemical composition to the distinct populations as identified on the ChMs of29 GCs. We find that stars in different regions of the ChM have differentcomposition: 1G stars share the same light-element content as field stars,while 2G stars are enhanced in N, Na and depleted in O. Stars enhanced in Aland depleted in Mg populate the extreme regions of the ChM. We investigate thecolor spread among 1G stars observed in many GCs, and find no evidence forvariations in light elements, whereas either a 0.1 dex Fe spread or a variationin He remain to be verified. In the attempt of analysing the global propertiesof the multiple populations, we have constructed a universal ChM, whichhighlights that, though variegate, the phenomenon has some common pattern. Theuniversal ChM reveals a tight connection with Na, for which we have provided anempirical relation. The additional ChM sequences typical of Type II GCs areenhanced in metallicity and, often, in s elements. Omega Cen can be classifiedas an extreme Type II GC, with a ChM displaying three main streams, each withits own variations in chemical abundances. One of the most noticeabledifferences is between the lower and upper streams, with the latter (associatedwith higher He) having higher Fe and lower Li. We publicly release ChMs.

monthly notices of the royal astronomical society

The Hubble Space Telescope UV Legacy Survey of Galactic Globular  Clusters. XIX. A Chemical Tagging of the Multiple Stellar Populations Over  the Chromosome Maps