BSN: Photometric Light Curve Analysis of Two Contact Binary Systems LS Del and V997 Cyg

A. Poro, M. Tanrıver, Elham Sarvari, Shayan Zavvarei, Hossein Azarara, Laurent Corp, Sabrina Baudart, Asma Ababafi, Nazanin Kahali Poor, Fariba Zare, Ahmet Bulut, Ahmet Keskin
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Abstract

The light curve analyses and orbital period variations for two W Ursae Majoris (W UMa) binary stars, LS Del and V997 Cyg, were presented in this work which was conducted in the frame of the Binary Systems of South and North (BSN) Project. Ground-based photometric observations were performed at two observatories in France. We used TESS (The Transiting Exoplanet Survey Satellite) data for extracting times of minima and light curve analysis of the target systems. The O-C diagram for both systems displays a parabolic trend. LS Del and V997 Cyg's orbital periods are increasing at a rate of $dP/dt= 7.20\times10^{-08}$ $d\ yr^{-1}$ and $dP/dt= 2.54\times10^{-08}$ $d\ yr^{-1}$, respectively. Therefore, it can be concluded that the mass is being transferred from the less massive star to the more massive component with a rate of $dM/dt=-1.96\times10^{-7}$ $M_\odot$ $yr^{-1}$ for LS Del system, and $dM/dt=-3.83\times10^{-7}$ $M_\odot$ $yr^{-1}$ for V997 Cyg. The parameters of the third possible object in the system were also considered. The PHysics Of Eclipsing BinariEs (PHOEBE) Python code was used to analyze the light curves. The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system's light curve maxima. The mass ratio, fill-out factor, and star temperature all indicate that both systems are contact binary types in this investigation. Two methods were used to estimate the absolute parameters of the systems: one method used the parallax of Gaia Data Release 3 (EDR3), and the other used a $P-M$ relationship. The positions of the systems were also depicted on the $M-L$, $M-R$, $q-L_{ratio}$, and $logM_{tot}-logJ_0$ diagrams.
BSN:两个接触双星系统 LS Del 和 V997 Cyg 的光度光曲线分析
这项工作是在南北双星系统(BSN)项目框架内进行的,介绍了两颗大熊座双星 LS Del 和 V997 Cyg 的光曲线分析和轨道周期变化。我们在法国的两个天文台进行了地基测光观测。我们利用 TESS(凌日系外行星巡天卫星)数据提取了目标系统的极小值时间并对其进行了光曲线分析。两个系统的O-C图都显示出抛物线趋势。LS Del和V997 Cyg的轨道周期分别以$dP/dt= 7.20\times10^{-08}$ $d\ yr^{-1}$和$dP/dt= 2.54\times10^{-08}$ $d\ yr^{-1}$的速度增长。因此可以得出结论,质量从质量较小的恒星转移到质量较大的恒星上的速率为:LS Del星系为$dM/dt=-1.96\times10^{-7}$ $M_\odot$$yr^{-1}$;V997 Cyg星系为$dM/dt=-3.83\times10^{-7}$ $M_\odot$$yr^{-1}$。同时还考虑了系统中第三个可能天体的参数。分析光曲线使用的是Python代码PHOEBE(PHysics Of Eclipsing BinariEs)。由于 LS Del 系统光曲线最大值的不对称,光曲线解需要一个冷星点。质量比、填充因子和恒星温度都表明这两个系统在本次调查中都属于接触双星类型。我们使用了两种方法来估算这两个系统的绝对参数:一种方法是使用盖亚数据第 3 版(EDR3)的视差,另一种方法是使用 $P-M$ 关系。系统的位置还被描绘在 $M-L$、$M-R$、$q-L_{ratio}$ 和 $logM_{tot}-logJ_0$ 图上。
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