Atila Poro, Mehmet Tanriver, Raul Michel, Ehsan Paki
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引用次数: 0
摘要
本文介绍了对八个大熊座W型双星系统的多波段测光研究。其中六个系统的光变曲线分析是首次提出。所有分析的系统温度都低于 5000 K,轨道周期小于 0.28 天。我们从这些系统的地面观测数据中提取了主极小值和次极小值。根据文献中报道的一些观测数据,我们考虑对 O - C 图进行线性拟合,并提出了新的星历表。光变曲线的求解使用了 "PHysics Of Eclipsing BinariEs "代码。质量比和填充因子的结果表明,这些系统是接触双星。其中六颗出现了奥康纳尔效应,每个伴星上都需要一个冷星斑来进行光曲线求解。它们的绝对参数是用另外两种方法估算和评价的。在这项研究中,利用由 414 个接触双星系统组成的样本和蒙特卡罗马尔可夫链方法更新了轨道周期和半长轴之间的经验关系。此外,还利用机器学习和人工神经网络模型更新了 P-T1-M1 之间的关系,以便更好地估计主星的质量。
Global Parameters of Eight W UMa-type Binary Systems
Multiband photometric investigations for eight binary systems of the W Ursae Majoris-type are presented. Six systems are presented for the first time to analyze their light curves. All the analyzed systems have a temperature below 5000 K and an orbital period of less than 0.28 days. We extracted primary and secondary minima from the ground-based observations of these systems. According to a few observations reported in the literature, linear fits were considered in the O − C diagrams, and new ephemerides were presented. Light curve solutions were performed using the PHysics Of Eclipsing BinariEs code. The results of the mass ratio and fillout factor indicate that the systems are contact binary stars. Six of them showed the O’Connell effect, and a cold starspot on each companion was required for light curve solutions. Their absolute parameters were estimated and evaluated by two other methods. In this study, the empirical relationship between the orbital period and semimajor axis was updated using a sample consisting of 414 contact binary systems and the Monte Carlo Markov Chain approach. Also, using Machine Learning and the Artificial Neural Network model, the relationship between P–T1–M1 was updated for a better estimation of the mass of the primary star.
期刊介绍:
The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.