Fast Apsidal Rotation and Physical Parameters of V1103 Cas.

We present the first high accuracy UBV RI(RI)c light curves of poor investigated eclipsing star V1103 Cas = GSC 3682 736 ( , , , B3 V). The geometric orbit of the system was built, the following physical characteristics of the system were found: T1 = 16 110 ± 400 K, M1 = 5.9 ± 0.3 , R1 = 4.41 ± 0.08 , T2 = 16 010 ± 400 K, M2 = 5.4 ± 0.3 , R2 = 3.77 ± 0.08 . The age of the components is 59 mln years. The photometric parallax , is close to GAIA DR1 value: . We found fast apsidal motion deg/year which is much bigger than the theoretical value under synchronism condition: deg/year. WDS catalogue is erroneously states that the star is the close optical pair. [ABSTRACT FROM AUTHOR]