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Statistics of 700 Individually Studied W UMa Stars
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2021-04-27 , DOI: 10.3847/1538-4365/abeb23
Olivera Latković , Atila Čeki , Sanja Lazarević

We present a statistical study of the largest bibliographic compilation of stellar and orbital parameters of W UMa stars derived by light-curve synthesis with Roche models. The compilation includes nearly 700 individually investigated objects from over 450 distinct publications. Almost 70% of this sample is comprised of stars observed in the past decade that have not been considered in previous statistical studies. We estimate the ages of the cataloged stars, model the distributions of their periods, mass ratios, temperatures, and other quantities, and compare them with the data from the Catalina Real-Time Transient Survey, LAMOST, and Gaia archives. As only a small fraction of the sample has radial-velocity curves, we examine the reliability of the photometric mass ratios in totally and partially eclipsing systems and find that totally eclipsing W UMa stars with photometric mass ratios have the same parameter distributions as those with spectroscopic mass ratios. Most of the stars with reliable parameters have mass ratios below 0.5 and orbital periods shorter than 0.5 days. Stars with longer periods and temperatures above 7000 K stand out as outliers and should not be labeled W UMa binaries. The collected data are available as an online database at https://wumacat.aob.rs.



中文翻译:

700 位独立研究的 W UMa 明星的统计数据

我们对 W UMa 恒星的恒星和轨道参数的最大文献汇编进行了统计研究,该文献是通过使用罗氏模型的光曲线合成得出的。该汇编包括来自 450 多种不同出版物的近 700 个单独调查的对象。该样本的近 70% 由过去十年中观察到的恒星组成,这些恒星在以前的统计研究中没有被考虑在内。我们估计编目恒星的年龄,对它们的周期、质量比、温度和其他数量的分布进行建模,并将它们与来自 Catalina 实时瞬态调查、LAMOST 和 Gaia 档案的数据进行比较。由于只有一小部分样本具有径向速度曲线,我们检查了完全和部分日食系统中光度质量比的可靠性,发现具有光度质量比的完全日食 W UMa 星具有与光谱质量比相同的参数分布。大多数参数可靠的恒星质量比低于0.5,轨道周期短于0.5天。周期较长且温度高于 7000 K 的恒星是异常值,不应标记为 W UMa 双星。收集的数据可作为在线数据库获取,网址为 https://wumacat.aob.rs。周期较长且温度高于 7000 K 的恒星是异常值,不应标记为 W UMa 双星。收集的数据可作为在线数据库获取,网址为 https://wumacat.aob.rs。周期较长且温度高于 7000 K 的恒星是异常值,不应标记为 W UMa 双星。收集的数据可作为在线数据库获取,网址为 https://wumacat.aob.rs。

更新日期:2021-04-27
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