Abstract Details
| Name: Dinesh Vasanta Hegde Affiliation: Student Conference ID: ASI2017_513 Title : Gaps in the Main-sequence of Star Clusters in the Large Magellanic Cloud Authors and Co-Authors : 1)Dinesha Vasanta Hegde I M.Sc Department of Studies in Physics Manasagangotri Campus University of Mysore, Mysore 2)Prof.Annapurni Subramaniam Professor, Indian Institute of Astrophysics, Bangalore - 560034 3)Prof. Rama Sagar NASI Senior Scientist Indian Institute of Astrophysics, Bangalore - 560034 4)Mr.Prasanta Nayak Senior Research Fellow Indian Institute of Astrophysics, Bangalore - 560034 Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : The main sequence (MS) of star clusters is known to have a few gaps, which are linked to some physical properties of stars. The MS gap in open clusters of our Galaxy is well studied, but no similar study exists in the Large Magellanic Cloud (LMC). For the first time, we present the identification and analysis of MS gaps in the LMC star clusters. We have used the CMDs of 1072 LMC star clusters presented in the catalogue of Nayak et al. (2016) constructed using V and V-I data from the OGLE III survey data for the detection of prominent gaps in the main sequence. After the identification of MS gaps through the observation of Integral Distribution Diagram(IDD) of individual star clusters of LMC , we estimated gap parameters such as, luminosity at the bright and faint ends of the gap, color index at the bright and faint ends of the gap and gap width. Finally we short-listed 22 clusters out of 1072 Cluster CMDs and then subjected those for Chi-Sqare Test. MS gaps of all 22 star clusters are found to be statistical significant. All the detected main sequence gaps are vertical gaps without showing the deficiency of stars in the color in their CMDs. Observed MS gaps in the LMC are located in the relatively brighter position than that of the well studied open clusters of our Galaxy. Dependence of the location of the MS gap with the cluster age is linear, as age increases luminosity gets fainter and color gets reddened. The above mentioned relation of location of the gap and cluster age is all most same as observed in the open clusters of our Galaxy. Linear relationship between the Gap width and cluster age does not exist in the star clusters of LMC as seen in the open clusters of our Galaxy. |