Marino, AnnaMilone, AntoninoPiotto, GVillanova, SBedin, L RBellini, ARenzini, Alvio2015-12-130004-6361http://hdl.handle.net/1885/80193We present a chemical abundance analysis based on high resolution UVES spectra of seventeen bright giant stars in the Globular Cluster (GC) M 22. We obtained an average iron abundance of [Fe/H] =-1.76*± 0.02 (internal errors only) and an a enhancement ofKeywords: Chemical abundance; Galaxy: globular clusters: individual: NGC 6656; Giant stars; Globular clusters; Group members; High resolution; High-resolution spectra; Iron content; Lower resolution; R-process; S-process; Stars: abundances; Stellar populations; Bar Galaxy: globular clusters: individual: NGC 6656; Stars: abundances200910.1051/0004-6361/2009118272016-02-24