再论食双星。纸张XII。F型孪生系统ZZ牧夫座
Rediscussion of eclipsing binaries. Paper XII. The F-type twin system ZZ Boötis
摘要：
ZZBoo是一个F-型的分离食双星系统，包含两颗几乎相同的恒星，在一个周期为4.992 d的圆轨道上运行。我们分析光变曲线从两个部门的观测与凌日系外行星调查卫星（TESS）和两组公布的径向速度的组成恒星，以确定其物理性质的高精度。我们发现质量为1.558 +/- 0.008 Msun和1.599 +/- 0.012 Msun，半径为2.063 +/- 0.006 Rsun和2.205 +/- 0.006 Rsun。在过去，主食和次食深度的相似性导致了混乱。TESS数据的高质量意味着我们可以第一次清楚地识别哪个是哪个。主星的温度确实比第二颗星高，但体积较小，质量也较小。我们定义了一个新的高精度的轨道星历，并获得有效的温度使用盖亚视差的系统。次级恒星比初级恒星更进化，并且发现太阳化学成分和年龄为1.7 Gyr的理论预测很好地吻合。
英文摘要：
ZZ Boo is an F-type detached eclipsing binary system containing two almost-identical stars on a circular orbit with a period of 4.992 d. We analyse light curves from two sectors of observations with the Transiting Exoplanet Survey Satellite (TESS) and two published sets of radial velocities of the component stars to determine their physical properties to high precision. We find masses of 1.558 +/- 0.008 Msun and 1.599 +/- 0.012 Msun, and radii of 2.063 +/- 0.006 Rsun and 2.205 +/- 0.006 Rsun. The similarity in the primary and secondary eclipse depths has led to confusion in the past. The high quality of the TESS data means we can, for the first time, clearly identify which is which. The primary star is conclusively hotter but smaller and less massive than the secondary star. We define a new high-precision orbital ephemeris and obtain effective temperatures using the Gaia parallax of the system. The secondary star is more evolved than the primary and a good agreement with theoretical predictions is found for a solar chemical composition and an age of 1.7 Gyr.
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