PHOTOMETRY, LIGHT CURVE SOLUTION AND PERIOD STUDY OF CONTACT BINARY BX AND

Serbian Astronomical Journal

article

Partovi M.¹  Abedi A.¹  Roobiat K.Y.¹ 

[1]Department of Physics, Faculty of Sciences, University of Birjand

[2]Dr. Mojtahedi Observatory, University of Birjand

关键词: Binaries;    close;    Binaries;    eclipsing;    Stars;    individual;    BX And;    Techniques;    photometric;   

DOI  :  10.2298/SAJ2103029P

来源: Astronomical Observatory, Department of Astronomy, Belgrade

【 摘 要 】

The photometry of the binary star BX And (HIP 10027) is performed during severalnights in October and November 2019, and October 2020 using B, V, and R Johnson-Cousins filtersin Dr. Mojtahedi Observatory of the University of Birjand. Astronomical image processing and datareduction are performed by the IRIS software and light curves are obtained. These curves, along withthe radial velocity data of the binary star, are analyzed by the Phoebe program to determine the physicaland geometric parameters of the system. The evolutionary state of this system is investigated using theHertzsprung-Russell (H-R) and density vs color index diagrams. The O-C curve is plotted using theeclipse times obtained in this study and those reported in the literature. By fitting a quadratic functionto this curve, a new linear ephemeris is obtained for the system, and the mass transfer rate betweenthe components of the system is determined. A periodic behavior is observed in the residuals, aftersubtracting the quadratic function from the O-C curve. These periodic changes are attributed to thepresence of a third component in the system. The parameters of the third component are determinedby fitting the light-time function to the residuals curve.

【 授权许可】

CC BY-NC-ND