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This paper presents the chemical abundance analysis of a sample of 18 giantstars in 3 old globular clusters in the Large Magellanic Cloud, namely NGC1786, NGC 2210 and NGC 2257. The derived iron content is [Fe/H]= --1.75+-0.01dex (sigma= 0.02 dex), --1.65+-0.02 dex (sigma= 0.04 dex) and --1.95+-0.02 dex(sigma= 0.04 dex) for NGC 1786, NGC 2210 and NGC 2257, respectively. All theclusters exhibit similar abundance ratios, with enhanced values (+0.30 dex) of[alpha/Fe], consistent with the Galactic Halo stars, thus indicating that theseclusters have formed from a gas enriched by Type II SNe. We also found evidencethat r-process are the main channel of production of the measured neutroncapture elements (Y, Ba, La, Nd, Ce and Eu). In particular the quite largeenhancement of [Eu/Fe] (+0.70 dex) found in these old clusters clearlyindicates a relevant efficiency of the r-process mechanism in the LMCenvironment.

Chemical composition of the old globular clusters NGC 1786, NGC 2210 and NGC 2257 in the Large Magellanic Cloud