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Astron. Astrophys. 350, 566-570 (1999)

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Long-term changes of the Be star OT Geminorum

H. Boi, D. Rudjak and D. Sudar

Hvar Observatory, Faculty of Geodesy, Zagreb University, Kaieva 26, 10000 Zagreb, Croatia

Received 26 March 1999 / Accepted 5 August 1999


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.[FORMULA] 4 in V occur. During the active phases, a cyclic oscillation of brightness of a period between 70 and 80 days is present, with the most probable value being 71.[FORMULA] 89.

A positive correlation was found between the light and colour variations and the emission strength in both phases.

Key words: stars: variables: general – stars: individual: OT Gem – stars: emission-line, Be

Send offprint requests to: H. Boi, (hbozic@geodet.geof.hr)

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© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999