Analysis of Physical Properties and Evolution of Contact Binary System V 701 Sco

Abstract

CCD photometric observations of Contact Binary System V 701 Sco were operated, using robotic telescopes at the Cerro Tololo Inter-American Observatory in Chile. The data were collected during May - August 2013. Three epochs of the minimum light of the system were taken along with others compiled from the literatures were used to find the new ephemeris equation for compute O – C diagram. The downward parabolic variation of the O-C indicates a continuous period decrease. We found that the rate of the period decrease with the rate of 0.0173 - 0.0205 syr-1. Weak evidence shows that periodic oscillation is superimposed on this curve. This change can be explained by the presence of third body with period of 27 years and the mass M₃ = 1.9 M_sun. The PHOEBE software was used to compute the best system’s parameters. The solution shows that the system with q = 0.98. The temperature to be T₁ = 23300 and T₂ = 23100 K.