Radial Distribution of Blue Stragglers in NGC 5466 using AstroSat

Abstract

We present the results obtained from Near-UV observations of the cluster NGC 5466 taken with UVIT onboard AstroSat to study the radial distribution of Blue Straggler Stars (BSSs), covering the cluster region up to a radius of 14${}^{\prime }$. Our study confirms that the BSSs are more centrally concentrated than Horizontal Branch (HB) stars in the cluster. We do not find a statistically significant rising trend in the radial distribution of BSSs for the outer regions, as most of the previously catalogued BSSs that are located in the cluster outskirts were found to be non-members, quasars or galaxies. This study highlights the importance of UV imaging combined with membership information to probe the radial distribution of BSSs.

arXiv comment4 pages, 2 figures, 1 table, to appear in Proceedings IAU Symposium No. 351 Star Clusters: From the Milky Way to the Early Universe, 2019

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