V839 Cep UBVRIRcIc light curves

For component A, the apsidal rotation rate was measured to be dw/dt=0.028deg/year, which exceeds the theoretical value under the condition of synchronism dw/dt=0.021 deg/year.

The physical parameters of the component stars of the eclipsing pair "A" were obtained: T1=13200+/-300K, M1=(3.7+/-0.15)M_{sun}_, R1=(2.57+/-0.05)R_{sun}_, T2=11900+/-250K, M2=(3.2+/-0.15)M_{sun}_, R2=(2.42+/-0.05)R_{sun}_, and components of the eclipsing pair B: T1=10600+/-200K, M1=(2.6+/-0.2)M_{sun}_, R1=(1.97+/-0.05)R_{sun}_, T2=5540+/-50K, M2=(0.88+/-0.05)M_{sun}_, R2=(0.84+/-0.05)R_{sun}_ The age of the system is determined to be 70 Myr with solar chemical composition.