标题： BQ Ari的第一光变曲线解和周期研究 显示英文标题

标题： The First Light Curve Solutions and Period Study of BQ Ari

摘要： 首次对BVR滤光片的光度观测进行了W UMa型双星系统BQ Ari的分析。使用Wilson-Devinney（W-D）代码结合蒙特卡洛（MC）模拟进行光变曲线分析，以确定其光度和几何元素及其不确定性。这些结果表明，BQ Ari是一个接触双星系统，光度质量比q=0.548\pm 0.019，填满因子f=24\pm 0.8百分比，轨道倾角i=85.09\pm 0.45。我们使用Gaia EDR3的视差来计算双星系统的绝对参数。这项研究提出了BQ Ari的新线性历表，结合了我们的新中点食时间与之前的观测，并使用蒙特卡洛马尔可夫链（MCMC）方法进行了分析。我们通过使用OCFit代码中的遗传算法（GA）和MCMC方法分析O-C图，首次分析了该系统的轨道周期行为。我们尝试用两种方法解释O-C图中线性拟合的残差；“LiTE + 二次”和“磁活动 + 二次”。尽管我们认为磁活动是可能的，但为了揭示轨道周期变化的性质，该系统应进一步研究。 显示英文摘要

摘要： The first analysis of the photometric observation in BVR filters of a W UMa type binary system BQ Ari was performed. Light curve analysis was performed using Wilson-Devinney (W-D) code combined with a Monte Carlo (MC) simulation to determine its photometric and geometric elements and their uncertainties. These results show that BQ Ari is a contact binary system with a photometric mass ratio q=0.548\pm0.019, a fillout factor f=24\pm0.8 percent, and an orbital inclination of i=85.09\pm0.45. We used the parallax from Gaia EDR3 for calculating the absolute parameters of the binary system. This study suggested a new linear ephemeris for BQ Ari, combining our new mid-eclipse times and the previous observations, which we analyzed using the Monte Carlo Markov Chain (MCMC) method. We present the first analysis of the system's orbital period behavior by analyzing the O-C diagram using the Genetic Algorithm (GA) and the MCMC approaches in OCFit code. We attempted to explain the analysis of the residuals of linear fit in the O-C diagram with two approaches; "LiTE + Quadratic" and "Magnetic activity + Quadratic". Although we consider the magnetic activity to be probable, the system should be studied further in order to reveal the nature of orbital period variations.