D'Antona, FrancescaD'Ercole, AMarino, AnnaMilone, AntoninoVentura, PVesperini, E2015-12-130004-637Xhttp://hdl.handle.net/1885/78787Recent examination of large samples of ω Cen giants shows that, as in mono-metallic globular clusters, sodium versus oxygen anticorrelation is present within each subset of stars with iron content in the range -1.9 ≲ [Fe/H] ≲ -1.3. These findings sugAuthor/s retain copyrightKeywords: globular clusters: general; globular clusters: individual (? Cen); stars: abundances; stars: evolution; stars: interiors201110.1088/0004-637X/736/1/52016-02-24