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We present the study of four FUV stars in the field of open cluster NGC 2420using the Ultra Violet Imaging Telescope (UVIT) mounted on AstroSat. The threestars 525, 527, and 560 are members, while star 646 is a non-member of thecluster. To characterize and determine the parameters of these stars,multi-wavelength spectral energy distributions (SEDs) are analyzed using UV,optical, and IR data sets. For all four FUV bright stars, a two-component SEDmodel fits well. Our findings indicate that two stars, 525 and 560, are binaryBSS systems. These binary BSS systems may have formed in a tertiary system dueto mass transfer from an evolved outer tertiary companion. Star 527 is a binarysystem of a BSS and an extremely low-mass (ELM) white dwarf, while Star 646 isa binary system of a horizontal branch star and an ELM white dwarf. Theeffective temperatures, radii, luminosities and masses of the two ELMs are(10250, 11500) K, (0.42, 0.12) Rsun, (1.61, 0.23) Lsun, and (0.186, 0.170)Msun, respectively. The star 527 could be a post-mass transfer system and mayhave originated through the Case A/B mass transfer process in a low-densityenvironment. The cooling age of the ELMs is < 1 Myr, indicating that they haveonly recently formed.

UOCS XIII. Study of the FUV bright stars in the open cluster NGC 2420 using ASTROSAT