Close binary systems in OB-associations regions. V. The star V456 Cyg in direction of Cyg OB1

1Zakirov, MM, 2Eshankulova, MU
1Uzbekistan National University, 100174, Vuzgorodok, Tashkent, Uzbekistan
2Astronomical Institute, Academy of Sciences of Uzbekistan, ul. Astronomicheskaya 33, 100052, Tashkent, Uzbekistan
Kinemat. fiz. nebesnyh tel (Online) 2006, 22(5):363-373
Language: Russian
Abstract: 

New UBVR photoelectric observations of the eclipsing variable star V 456 Cyg of Algol type were obtained at the Maidanak Observatory in 1999—2003. The new ephemeris of the binary is: Min I = JDH2444911.3592(7) + 0.89119484(14)dE + 0.15(l)d⋅10-9⋅E2. All of the light curves of the star V456 Cyg were solved by Lavrov's direct method, and elements of the photometric orbit were calculated. The results obtained in R-curve are different from data for other ones. We estimated the absolute basic parameters of the components: M1 = 2.0M, M2 = 1.7M, R1 = 1.7R, R2 = 1.6R, M1,bol = +1.7m, M2,bol = +2.5m. The components do not reach ZAMS in the H—R diagram and their age is 107 yrs. The distance for the star V456 Cyg is about 600 pc. The star lies in a well-maked OB-stars group separated by a distance of about 500 pc in the direction of the OB-association Cyg OBl.

Keywords: close binary system, OB-association, variable stars