* Astronomy

Title: KIC 7385478: An eclipsing binary with a gamma Doradus component
Author: Orkun Ozdarcan, Hasan Ali Dal

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 M_1 = 1.71 ± 0.08 solar masses, M_2 = 0.37 ± 0.04 solar masses ~ and R_1 = 1.59 ± 0.03 solar radii, R_2 = 1.90 ± 0.03 solar radii, respectively. Position of the primary component in HR diagram is in the region of 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 gamma 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.

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