KIC 7385478: An Eclipsing Binary with a γ Doradus Component

Abstract

We present spectroscopic and photometric analysis of the eclipsing binary KIC 7385478. We find that the system is formed by F1V + K4III-IV components. Combining results from analysis of spectroscopic data and Kepler photometry, we calculate masses and radii of the primary and the secondary components as M1 = 1.71 ± 0.08 M , M2 = 0.37 ± 0.04 M and R1 = 1.59 ± 0.03R , R2 = 1.90 ± 0.03R , respectively. Position of the primary component in HR diagram is in the region of γ Doradus type pulsators and residuals from light curve modeling exhibit additional light variation with a dominant period of ∼0.5 day. These are clear evidences of the γ Doradus type pulsations on the primary component. We also observe occasional increase in amplitude of the residuals, where the orbital period becomes the most dominant period. These may be attributed to the cool star activity originating from the secondary component.

The effect of tides on near-core rotation: analysis of 35 Kepler $γ$ Doradus stars in eclipsing and spectroscopic binaries

“…The known γ Dor binaries whose period spacings have already been measured are: KIC 3341457 (Li et al 2019b(Li et al , 2020; KIC 4142768 ; KIC 7385478 Özdarcan & Dal 2017); KIC 8197406 (Li et al 2020); KIC 8197761 (Li et al 2019a); KIC 9592855 (Guo et al 2017); KIC 10080943 in which both components pulsate (Keen et al 2015;Schmid & Aerts 2016;Schmid et al 2015); and KIC 10486425 (Zhang et al 2018).…”

Solar-Type Eclipsing Binary Kic 4832197: Physical Properties and Intrinsic Variability of the Components

“…In some cases, Kepler photometry revealed effects of two separate variability mechanisms, (e.g. pulsation and cool spot activity), in eclipsing binary system (see, e.g., Özdarcan & Dal 2017).…”