论文标题
开放式群集Ruprecht147。III：三重系统EPIC 219552514在主要序列转口处
Eclipsing binaries in the open cluster Ruprecht 147. III: The triple system EPIC 219552514 at the main-sequence turnoff
论文作者
论文摘要
报道了在2.75天，两层，脱落的二进制Epic 219552514的观察结果。 0.649（+0.015 / -0.014）主要和次级的MSUN，R1 = 2.505（+0.026 / -0.031）RSUN RSUN和R2 = 0.652（+0.013 / -0.012）RSUN分别分别为RSUN。对于F7初级，有效温度为6180 +/- 100 K，对于晚期K次级的4010 +/- 170 K。轨道是圆形的，恒星的旋转似乎与轨道运动同步。这是在我们先前对EPIC 219394517和EPIC 219568666的研究中分析的第三个黯然失色的系统。与PARSEC系列中的恒星进化模型相比，我们推断出2.67（+0.39 / -0.55）的年龄与该估计值一致的GRE（+0.39 / -0.55）GYR是一致的。 EPIC 219552514是一个分层三重系统，略微偏心的外轨道的周期为463天。看不见的三级是低质量的M矮人或白矮人。
Spectroscopic observations are reported for the 2.75 day, double-lined, detached eclipsing binary EPIC 219552514 located at the turnoff of the old nearby open cluster Ruprecht 147. A joint analysis of our radial velocity measurements and the K2 light curve leads to masses of M1 = 1.509 (+0.063 / -0.056) MSun and M2 = 0.649 (+0.015 / -0.014) MSun for the primary and secondary, along with radii of R1 = 2.505 (+0.026 / -0.031) RSun and R2 = 0.652 (+0.013 / -0.012) RSun, respectively. The effective temperatures are 6180 +/- 100 K for the F7 primary and 4010 +/- 170 K for the late K secondary. The orbit is circular, and the stars' rotation appears to be synchronized with the orbital motion. This is the third eclipsing system analyzed in the same cluster, following our earlier studies of EPIC 219394517 and EPIC 219568666. By comparison with stellar evolution models from the PARSEC series, we infer an age of 2.67 (+0.39 / -0.55) Gyr that is consistent with the estimates for the other two systems. EPIC 219552514 is a hierarchical triple system, with the period of the slightly eccentric outer orbit being 463 days. The unseen tertiary is either a low-mass M dwarf or a white dwarf.
