Photometric and Spectroscopic Analysis of Four Contact Binaries

Abstract We present the photometric and spectroscopic analysis of four W UMa binaries J015829.5+260333 (hereinafter as J0158), J030505.1+293443 J0305), J102211.7+310022 J1022), KW Psc. The VR c I band observations are carried out with 1.3 m Devasthal Fast Optical Telescope (DFOT). For low-resolution spectroscopy, we used 2 Himalayan Chandra (HCT) well archival data from 4 LAMOST survey. systems J0158 J0305 show a period increase rate 5.26( ± 1.72) × 10 −7 days yr −1 1.78( 1.52) −6 , respectively. J1022 is found to be decreasing 4.22 ( 1.67) . Psc displays no change in its period. PHOEBE package for light-curve modeling basic parameters evaluated help GAIA parallax. asymmetry light curves explained assumption cool spots at specific positions on one components system. On basis temperatures, mass ratios, fill-out factors, periods, system identified W-subtype while others some mixed properties. To probe chromospheric activities these binaries, their spectra compared known inactive stars’ spectra. comparison shows emission H α β Ca II understand evolutionary status systems, plotted mass–radius mass–luminosity planes other characterized binary systems. secondary all away ZAMS, which indicates that more evolved than primary component.