The A/F-type stars and pulsators ( \delta Scuti- \gamma Dor ) are in a critical regime where they experience the transition from radiative to convective transport of energy in their envelopes .
Such stars can pulsate in both gravity and acoustic modes .
Hence , the knowledge of their fundamental parameters along with their observed pulsation characteristics can help in improving the stellar models .
When residing in a binary system , these pulsators provide more accurate and less model dependent stellar parameters than in the case of their single counterparts .
We present a light curve model for the eclipsing system KIC 6048106 based on the Kepler photometry and the code PHOEBE .
We aim to obtain accurate physical parameters and tough constraints for the stellar modelling of this intermediate-mass hybrid pulsator .
We performed a separate modelling of three light curve segments that show a distinct behaviour due to a difference in activity .
We also analysed the Kepler ETVs .
KIC 6048106 is an Algol-type binary with F5-K5 components , a near-circular orbit and a 1.56-d period undergoing variations of the order of \frac { \Delta P } { P } \simeq 3.60 \times 10 ^ { -7 } in 287 \pm 7 days .
The primary component is a main-sequence star with M _ { \mathrm { 1 } } = 1.55 \pm 0.11 M _ { \sun } ,~ { } R _ { \mathrm { 1 } } = 1.57 \pm 0.12 R _ { \sun } .
The secondary is a much cooler subgiant with M _ { \mathrm { 2 } } = 0.33 \pm 0.07 M _ { \sun } ,~ { } R _ { \mathrm { 2 } } = 1.77 \pm 0.16 R _ { \sun } .
Many small near-polar spots are active on its surface .
The second quadrature phase shows a brightness modulation on a time scale 290 \pm 7 days , in good agreement with the ETV modulation .
This study reveals a stable binary configuration along with clear evidence of a long-term activity of the secondary star .