Hot Stellar Populations of Berkeley 39 Using Swift/UVOT
Komal Chand,
Department of Physics, Birla Institute of Technology and Science-Pilani, 333031 Rajasthan, India. Corresponding author: p20210463@pilani.bits-pilani.ac.in
Khushboo Kunwar Rao,
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,
Department of Physics, Birla Institute of Technology and Science-Pilani, 333031 Rajasthan, India
Abstract
Open clusters are excellent tools to probe the history of the Galactic disk and properties of star formation. In this work, we present a study of an old age open cluster Berkeley 39 using the observations from UVOT instrument of the Neil Gehrels Swift observatory. Making use of a machine learning algorithm, ML-MOC, we have identified a total of 861 stars as cluster members out of which 17 are blue straggler stars. In this work, we present a characterisation of two blue straggler stars. To estimate the fundamental parameters of blue straggler stars and their companions (if any), we constructed spectral energy distributions using UV data from Swift/UVOT and GALEX, optical data from Gaia DR3, and infrared (IR) data from 2MASS, Spitzer/IRAC, and WISE. We find excess flux in UV in one blue straggler star, implying the possibility of a hot companion.
Keywords : Blue Straggler Stars, Open Clusters, Spectral Energy Distributions, Berkeley 39
To cite this article
Komal Chand, Khushboo Kunwar Rao, Kaushar Vaidya & Anju Panthi, «Hot Stellar Populations of Berkeley 39 Using Swift/UVOT», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 262-272 URL : http://popups.ulg.be/0037-9565/index.php?id=11671.
