Abstract Details

Name: Naman Joshi
Affiliation: IISER Bhopal
Conference ID: ASI2021_384
Title : High Mass Binary Population in Galactic Open Clusters
Authors and Co-Authors : Naman Joshi(Indian Institute of Science Education and Research, Bhopal), Vikrant Jadhav(Joint Astronomy Programme and Department of Physics, Indian Institute of Science, Bangalore), Annapurni Subramaniam(Indian Institute of Astrophysics, Bangalore)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Binary star fraction plays a vital role in understanding the dynamics and evolution of star clusters and finds application in various research fields in astrophysics. The main objective of this study was to calculate the binary fraction (BF) of open clusters in our galaxy using photometric data obtained from GAIA DR2. We constructed the Colour Magnitude Diagrams (CMDs) of 23 Galactic open clusters and used various parameters like distance modulus, metallicity, extinction and reddening along with TOPCAT and python programs to fit theoretical isochrones to CMDs. We identified the binary systems based on their location on CMD and calculated the BF for mass-ratio greater than 0.75. We observed the BF values of 0.13 to 0.39 for a variety of clusters, with an average of 0.20. There is a weak positive correlation between integrated cluster magnitude and BF. The mean cluster BF is similar to BF among stars with 0.9-1.2 Msun mass range, whereas more massive stars showed larger BF and fainter stars typically have a lesser BF. The reducing BF for lower mass stars is similar to what is observed in field binary population indicating open cluster binary population is similar to primordial binaries.