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In the last years, photometric and spectroscopic evidence has demonstratedthat many, maybe all the Globular Clusters (GC) host multiple stellarpopulations. High-resolution spectroscopy has established that, while most GCsare mono-metallic with no significant abundance spread in $s$-elements, in allthe globulars studied to date the presence of different stellar generation isinferred by the Na-O and the C-N anticorrelations. In this context, NGC 1851and NGC 6656 are among the most intriguing clusters. Contrary to the majorityof GCs, they host two groups of stars with different s-elements abundance thatare clearly associated to the two distinct sub-giant and red-giant branchesdetected in their color-magnitude diagrams (CMD). In the case of NGC 6656s-rich stars are also enriched in iron and calcium. Each $s$-element groupexhibits its own Na-O and C-N anticorrelations thus indicating the presence ofsub-populations and suggesting that the parent clusters have experienced a verycomplex star-formation history. In this paper we summarize the properties ofmultiple populations in NGC 1851 and NGC 6656.

Multiple stellar populations in the Globular Clusters NGC1851 and NGC6656 (M22)