Abstract Details

Name: Souradeep Bhattacharya
Affiliation: Birla Institute of Technology and Science, Pilani
Conference ID: ASI2017_1170
Title : Stellar Mass Segregation of the aged Galactic Open Cluster Berkeley 17
Authors and Co-Authors : Ishan Mishra (Indian Institute of Technology, Guwahati, India), Kaushar Vaidya (Birla Institute of Technology and Science, Pilani, India), Wen-Ping Chen (Graduate Institute of Astronomy, National Central University, Taoyuon, Taiwan)
Abstract Type : Poster
Abstract Category : Stars,ISM and the Galaxy
Abstract : We present an analysis of the morphology of Berkeley 17, the oldest known open cluster (∼10 Gyr), using a probabilistic star counting of Pan-STARRS point sources, and confirm its core-tail shape, plus an antitail, previously detected with 2MASS data. The stellar population, as diagnosed by the color-magnitude diagram and theoretical isochrones, shows more massive than lower-mass members in the cluster core, whereas there is a paucity of massive members in both tails. This manifests mass segregation in this aged star cluster with the low-mass members being stripped away from the system. It has been claimed that Berkeley 17 is associated with an excessive number of blue stragglers. Our analysis in comparison of the cluster with nearby reference fields indicates that about half of the blue stragglers may be field contaminations, and some may be confused with the rare blue horizontal-branch stars in this cluster.