Discovery of UV bright stellar population candidates in NGC 5053 using AstroSat-UVIT
Earth and Space Sciences
Globular clusters are known to serve as fundamental test beds for stellar evolution theories. NGC 5053, a metal-poor and a rather dispersed globular cluster, was studied in the ultraviolet regime with AstroSat's Ultra Violet Imaging Telescope (UVIT). The images of the cluster were analyzed in various filters across the FUV and NUV bands by a team led by IIST researchers. The team discovered eight blue straggler candidates, six evolved blue straggler candidates, and an extreme horizontal branch candidate among the cluster's new probable UV bright population. Using GAIA EDR3 data, a proper motion analysis was used to validate their association with the cluster, and spectral energy distribution (SED) studies were used to corroborate the nature of these candidates. Furthermore, the radial distribution analysis of the blue straggler population shed some light on the potential formation mechanism of these stars in NGC 5053
Caption: (Left) UVIT-AstroSat image of the globular cluster NGC 5050 with the far-ultraviolet emission displayed in blue and near-ultraviolet emission in yellow. The image also shows the location of a few discovered candidates of the cluster. (Right) The UVIT color-magnitude diagram showing the cluster's various populations.
Ref: Stellar populations of the globular cluster NGC 5053 investigated using AstroSat - Ultra Violet Imaging Telescope, K. J. Nikitha, S. Vig and S. K. Ghosh, 2022, Monthly Notices of Royal Astronomical Society (MNRAS), Volume 514, Issue 4, August 2022, Pages 5570–5582, https://doi.org/10.1093/mnras/stac1444 .
