Orbital Period Analysis and Absolute Parameters of the Eclipsing Binary V404 Gem
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Abstract
In this research, we analyze the orbital period and absolute parameters of the eclipsing binary V404 Gem. This work used the 0.7-meter reflecting telescope with CCD photometric system in blue and visual bands. The photometric data were obtained in 9, 10 and 12 January 2019 at the Thai National Observatory, Nakhon Ratchasima (Chalermprakhiat Astronomical Observatory Commemorating King Bhumibhol's 7th Birthday Anniversary). The data reduction and measuring the magnitude were processed by differential photometric technique with SIRIL program. The orbital period was analyzed by Observed-minus-Calculated (O-C) diagram. The synthesizing light curves were predicted for absolute parameters with PHOEBE program. The results showed that the orbital period changes increased to dP/dt = 3.45(±0.20) x10-7 days per year. The effective temperature of the primary and secondary stars, the inclination, surface potential and the mass ratio were 5528 K, 5440(±15) K, 78.63(±0.37) degree, 7.21(±0.01) and 3.43, respectively. The increasing of orbital period revealed an evolutionary status of the eclipsing binary V404 Gem, which both components moving away from the center of mass. The solutions of absolute parameters showed that the classification of this system was a W-subtype of W Ursae Majoris binary star system.
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