| Name: Anamika Sharma |
| Affiliation: Birla Institute of Science and Technology, Pilani |
| Conference ID: ASI2026_332 |
| Title: NGC 2204: Cluster dynamics and study of Blue Straggler and Red clump stars using Swift/UVOT |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Anamika Sharma(Department of Physics, Birla Institute of Technology and Science-Pilani, 333031 Rajasthan,India), Kaushar Vaidya(Department of Physics, Birla Institute of Technology and Science-Pilani, 333031 Rajasthan,India), Anju panthi(Indian Institute of Astrophysics, Bangalore 560034, India), Komal Chand(Department of Physics, Birla Institute of Technology and Science-Pilani, 333031 Rajasthan,India) |
| Abstract: In this study, we examine the presence of unresolved hot companions to blue straggler stars (BSS) and red clump (RC) stars in an intermediate-age (∼2.2 Gyr) open cluster NGC 2204 using Swift/UVOT. The cluster is located at a distance of ∼4100 pc with metallicity [Fe/H] ∼ −0.4 and a color excess of E(B−V) ∼ 0.08. We identified 734 stars as cluster members, including 7 BSS and 20 RC stars, using a machine learning based method for open clusters (ML-MOC) on Gaia DR3 data. To know the dynamical state of the cluster, we presented the cumulative radial distributions of different stellar populations. To characterize the BSS and RC stars, we constructed their spectral energy distributions (SEDs) by combining Swift/UVOT photometry with archival data spanning from ultraviolet (UV) to infrared wavelengths. Based on the analysis of SEDs, we found that two BSS and three RC stars have significant UV excess, indicating the possibility of hot companions. |
