SIMBAD references

An analysis of the set of the minimum timings of the Algol-type eclipsing binary VV UMa is presented. The period variations are cyclic with the cycle-length of 22years. They are consistent with the presence of the third body with the orbital period P₂=22.28years and minimum mass of 0.4M_☉. The apsidal motion must be ruled out because VV UMa is a semi-detached system according to the previous analyses. The stellar magnetic activity (Applegate =1992ApJ...385..621A) of the cold convective secondary may be an alternative cause of the observed period changes. The cycle-length, the magnitude of the period change and other characteristics are consistent with the magnetic activity.