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KIC 7385478: An Eclipsing Binary with a gamma Doradus Component
Özdarcan, Orkun; Dal, Hasan Ali
AA(Science Faculty, Department of Astronomy and Space Sciences, Ege University, 35100 Bornova, Izmir, Turkey), AB(Science Faculty, Department of Astronomy and Space Sciences, Ege University, 35100 Bornova, Izmir, Turkey)
Publications of the Astronomical Society of Australia, Volume 34, id.e017 16 pp. (PASA Homepage)
Publication Date:
Astronomy Keywords:
(stars:) binaries: eclipsing, stars: fundamental parameters, stars: individual (KIC 7385478), stars: oscillations (including pulsations)
Abstract Copyright:
2017: Astronomical Society of Australia
Bibliographic Code:


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 M&sun;, M 2 = 0.37 ± 0.04 M&sun; and R 1 = 1.59 ± 0.03 R&sun;, R 2 = 1.90 ± 0.03 R&sun;, respectively. Position of the primary component in HR diagram is in the region of gamma Doradus type pulsators and residuals from light curve modelling exhibit additional light variation with a dominant period of 0.5 d. 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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