http://arxiv.org/abs/2006.00528
The first complete analysis of the photometric observation of the W UMa type binary system BQ Ari was performed using the Wilson-Devinney code to determine its photometric and geometric elements. These results show that BQ Ari is a contact W UMa binary system with a photometric mass ratio q = 0.91, and the fillout factor equal to 34 percent. We calculated the distance of BQ Ari to be 146.24 \pm 15 parsec. In this study, we suggested a new linear ephemeris for BQ Ari, combining our new mid-eclipse times and the previous observations. We present the first complete analysis of the system’s orbital period behavior and analysis of the O-C diagram using the Genetic Algorithm (GA) and the Monte Carlo Markov Chain (MCMC) approaches in OCFit code. We applied two approaches to analyze the sinusoidal trend in the O-C diagram. This may suggest a periodic change caused by the Light-Time Effect (LiTE) effect with a period of 4.60 years and an amplitude of 6.212 minutes. On the other hand, the sinusoidal trend may indicate the existence of magnetic activity in this system. The period of magnetic activity was calculated to be 4.16 years and changes of period induced by magnetic activity obtained as DeltaP/P=4.36x 10^(-7). It was concluded that magnetic activity is more likely to be the causal agent as opposed to the LiTE signals.
A. Poro, F. Davoudi, O. Basturk, et. al.
Tue, 2 Jun 20
81/90
Comments: 17 pages, 12 figures, 8 tables, Submitted to Astrophysics and Space Science