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NGC5694: another extra-galactic globular cluster

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arxiv 1301.3606 v1 pith:YYJ7V4QG submitted 2013-01-16 astro-ph.GA

A. Mucciarelli , M. Bellazzini , M. Catelan , P. Amigo , M. Correnti , C. Cortés , E. Dalessandro , V. D'Orazi This is my paper · ORCID
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keywords clusterglobularngc5694abundancedwarfextra-galactichalospheroidal
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We discuss the chemical composition of six giant stars of the outer Halo globular cluster NGC5694, through the analysis of UVES@FLAMES high-resolution spectra. The cluster has an average iron content [Fe/H]=--1.83+-0.01, solar-scaled [alpha/Fe] ratios and a very low Ba abundance ([Ba/Fe]=--0.71+-0.06). These anomalous abundance patterns are different from those observed in other Halo globular clusters but similar to those of the metal-poor stars in typical dwarf spheroidal galaxies. These findings suggest an extra-galactic origin for NGC5694, likely from a dwarf spheroidal galaxy.

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