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Astron. Astrophys. 356, L21-L24 (2000)

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Letter to the Editor

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

E.T. Belokon 1, M.K. Babadzhanyants 1 and J.T. Pollock 2

1 St.-Petersburg University, Astronomical Institute, Petrodvorets, St.-Petersburg, 198904, Russia (bel@astro.spbu.ru, mkb@astro.spbu.ru)
2 Appalachian State University, Dark Sky Observatory, Boone, North Carolina, USA (pollockjt@appstate.edu)

Received 30 August 1999 / Accepted 21 February 2000


The extraordinary optical outburst of ON 231 which occurred in spring 1998 (Massaro et al. 1999) 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.

Key words: galaxies: BL Lacertae objects: general – galaxies: BL Lacertae objects: individual:

* Table 1 is only available electronically at the CDS via anonymous ftp (ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/356/L21 or http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/356/L21

Send offprint requests to: E.T. Belokon

© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000