NGC5694: another extra-galactic globular cluster
Abstract
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.
Cite
@article{arxiv.1301.3606,
title = {NGC5694: another extra-galactic globular cluster},
author = {A. Mucciarelli and M. Bellazzini and M. Catelan and P. Amigo and M. Correnti and C. Cortés and E. Dalessandro and V. D'Orazi},
journal= {arXiv preprint arXiv:1301.3606},
year = {2013}
}
Comments
4 pages, 3 figures, proceedings of the meeting "Reading the book of globular clusters with the lens of stellar evolution", Rome, Nov. 26-28, 2012, to be published in Memorie della Societa' Astronomica Italiana