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Observations obtained in 1995-1996 of the Be star OT Geminorum are reported and show that in octo- ber 1995 the star reached a very active phase with large variations around a bright plateau, a phase of activity we have also distinguished in previous observations dating from 1960. The time scales involved are discussed and suggest that the violent variations of the activity propagate very quickly on the whole surface of the star or on a huge por- tion of it. No likely pulsation periods were found. The assumption that the detected activity is due to the eects of an hypothetical companion leads to conclude that such companion could not be detected by the present interferometric techniques.

Monitoring the activity of the Be star OT Geminorum