The Physical Properties and Starspot Activity of the Triple System KIC 6525196

Abstract

Abstract We present the results of photometric and spectroscopic analyses for the triple-lined system KIC 6525196, an eclipsing binary accompanied by a third star. By modeling the Kepler light curves and radial velocities from LAMOST and HIDES observations, absolute parameters of the system are determined. Both components of the eclipsing binary are found to be solar-like stars with masses and radii of M 1 = 1.0286 ± 0.0026 M ⊙, R 1 = 1.127 ± 0.008 R ⊙, and M 2 = 0.9667 ± 0.0024 M ⊙, R 2 = 0.963 ± 0.007 R ⊙. The mass of the third star is determined to be M 3 = 0.772 ± 0.010 M ⊙. With the out-of-eclipse light residuals, we measure rotation period and decay timescale of an active region by using the autocorrelation function. In comparison to the Sun, the activity level of the system is significantly stronger. In addition, a possible short photometric activity cycle of ∼244 days is detected.