KIC 5956776 : from Light Curve Acquiring to Absolute Dimension Determining

Abstract

This research aims to explain the process of obtaining light curve from the Kepler Space Telescope Database, the analysis of light curve fitting by using the Wilson & Devinney code that provide relative physical parameters, and the way proposed to estimate absolute physical parameters of eclipsing binary KIC 5956776 when radial velocity curves are absent. The light curve of the system presented as one of the Beta Lyrae type. The results of light curve analysis suggested that the absolute physical parameters of primary and secondary stars respectively are as follows: Temperature T₁  = 3737 K and T₂ = 6946±128 K. Potential energy at the star surface ₁  =3.78±0.01 and ₂  = 3.49±0.01. The inclination of the orbital plane  is 77.09±0.07 degree. The average radius of the primary and secondary stars are _1average  =0.315±0.001  /a     and _2average  = 0.327±0.01  /a , respectively. Assuming that both primary and seconday stars are main-sequence stars. The radius of each star can be calculated as  ₁ = 1.00 ± 0.01 and  ₂ = 1.04 ± 0.01 . This makes it possible to calculate reversely back and get the value of a semi-major axis ()  of 3.17 ± 0.01   and therefore ₁ = 1.00 ± 0.01 ,    2 =1.05 ± 0.01 ,  q= 1.05 ± 0.01, as the result.