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In the present study, we identified an extremely low-mass white dwarf as acompanion to a low luminous blue straggler star within the Galactic globularcluster NGC 362. To conduct the analysis, we utilized data obtained fromvarious sources, including AstroSat Ultra Violet Imaging Telescope, UVOT, andthe 2.2-m ESO telescope. By examining the spectral energy distribution of theblue straggler star candidate, we successfully identified an extremely low masswhite dwarf as its binary companion. We determined the effective temperature,radius, and luminosity for both, the extremely low-mass white dwarf and theblue straggler star candidate. Specifically, the extremely low-mass white dwarfexhibits an effective temperature of 15000 K, a radius of 0.17 Rsun, aluminosity of 1.40 Lsun, and a mass range of 0.19-0.20 Msun. Furthermore, theposition of the straggler star within the cluster suggests their formation viathe Case A/B mass-transfer mechanism in a low-density environment.

UVIT/AstroSat Investigation of a low luminous Blue Straggler Star in NGC 362: Detection of extremely low mass white dwarf as companion