We present the { \it Kepler } photometry of KIC 6048106 exhibiting O ’ Connell effect and multiperiodic pulsations .
Including a starspot on either of the components , light-curve synthesis indicates that this system is a semi-detached Algol with a mass ratio of 0.211 , an orbital inclination of 73.9 deg , and a large temperature difference of 2,534 K. To examine in detail both spot variations and pulsations , we separately analyzed the Kepler time-series data at the interval of an orbital period by an iterative way .
The results reveal that the variable asymmetries of the light maxima can be interpreted as the changes of a magnetic cool spot on the secondary component with time .
Multiple frequency analyses were performed in the outside-eclipse light residuals after removal of the binarity effects from the observed Kepler data .
We detected 30 frequencies with signal to noise amplitude ratios larger than 4.0 , of which six ( f _ { 2 } – f _ { 6 } and f _ { 10 } ) can be identified as high-order ( 17 \leq n \leq 25 ) low-degree ( \ell = 2 ) gravity-mode pulsations that were stable during the observing run of 200 d. In contrast , the other frequencies may be harmonic and combination terms .
For the six frequencies , the pulsation periods and pulsation constants are in the ranges of 0.352 - 0.506 d and 0.232 - 0.333 d , respectively .
These values and the position on the HR diagram demonstrate that the primary star is a \gamma Dor variable .
The evolutionary status and the pulsation nature of KIC 6048106 are discussed .