ON 231: the testing of 3.8-year period for optical outbursts with multi-peak structure

Astronomy and Astrophysics – Astrophysics

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Galaxies: Bl Lacertae Objects: General, Galaxies: Bl Lacertae Objects: Individual:

Scientific paper

The extraordinary optical outburst of ON 231 which occurred in spring 1998 (Massaro et al. \cite{mss99}) and its behavior during 1999 is in very good agreement with the predictions made by use of the 3.8-year period that was found from the analysis of prior observations (all B-band data available in the 1971-1997 time interval). The periodic outbursts of ON 231 have a multi-peak structure that is possibly a more complex variant of the double-peak one detected for periodic outbursts in OJ 287. Some further predictions of variability behavior are given. Table~1 is only available electronically at the CDS via anonymous ftp 130.79.128.5

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