Long-term changes of the Be star OT Geminorum

We investigate the character of light variability of the bright Be star OT Gem. Two phases of the long-term light changes were distinguished: - a quiet phase which is characterized by mild light changes, and - an active phase in which the sudden increases of brightness up to 0.(m) 4 in V occur. During the active phases, a cyclic oscillation of brightness o f a period between 70 and 80 days is present, with the most probable value being 71.(d) 89. A positive correlation was found between the light and colour variations an d the emission strength in both phases.