Abstract Details
| Name: Anju Panthi Affiliation: Birla Institute of Technology and Science - Pilani, Pilani Campus Conference ID: ASI2025_140 Title : UV-based study of an open cluster NGC 2627 using AstroSat Authors and Co-Authors : Pinapathi Saketh, Anju Panthi, and Kaushar Vaidya Abstract Type : Poster Abstract Category : Stars, Interstellar Medium, and Astrochemistry in Milky Way Abstract : We investigate the intermediate-age open cluster NGC 2627, located at ~ 2 kpc, using UVIT/AstroSat and other archival data. By applying the machine learning algorithm ML-MOC on Gaia DR3 data, we identify 422 cluster members, which include four blue straggler stars (BSSs), one yellow straggler star (YSS), one blue lurker (BL), one red clump (RC) star, and two binary candidates detected in both the UVIT/F148W and UVIT/F169M filters. We characterize these stars using multiwavelength spectral energy distributions (SEDs). Among the nine sources mentioned above, one BSS, the BL, and one binary candidate were found to have sources within 3’’ radius, so we did not fit their SEDs. Of the remaining six sources, we successfully fit two with single-component SEDs and four with the binary-component SEDs. The parameters derived from these binary-component SEDs suggest that the hot companions of the BSSs, YSS, RC star, and one binary candidate are extremely low-mass white dwarfs, confirming that at least four out of the nine stars (44%) are formed via mass transfer. We fit King’s profile to the high-probability cluster members (p > 0.8) and determine the core radius (rc ) to be 3.84′ and the tidal radius (r t ) to be 36.85′. Our analysis shows that equal-mass binaries are most concentrated near the cluster center, followed by single massive stars and single low-mass stars. Additionally, the BSS population is located within a radius of ~10 times r c , indicating that the cluster is dynamical evolved. |