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Description
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_-0.056_^+0.063^M_{sun}_ and M2=0.649_-0.014_^+0.015^M_{sun}_ for the primary and secondary, along with radii of R1=2.505_-0.031_^+0.026^R_{sun}_ and R2=0.652_-0.012_^+0.013^R_{sun}_, respectively. The effective temperatures are 6180+/-100K for the F7 primary and 4010+/-170K 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_-0.55_^+0.39^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.
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