Period Change Analysis of a W UMa-type Binary: V417 Aquilae

Abstract

Light curve analysis investigated the orbital period variations of the short period, overcontact eclipsing binary system, and V417 Aquilae (V417 Aql). The system was observed using a 0.70-meter telescope with a CCD photometric system using B and V filters at the Regional Observatory for the Public, Songkhla, Thailand, on 2 July 2021 UT. The light curve constructed by the photometric method for each filter was analyzed to find the period change of the system. It is found that the V417 Aql system is undergoing a long-term decrease of rate 0.00251 seconds/year. The reduction in the period showed that the distance between the stars was decreased according to Angular Momentum Loss (AML) theory. V417 Aql residuals tend to be periodic, indicating there might be a third body in the system. The calculation shows that the third body’s distance, period, and mass function are about 1.97 AU, 47.7 years, and 0.19Mʘ, respectively.