The extraordinary optical outburst of ON 231 (W Com) in spring 1998

Details The extraordinary optical outburst of ON 231 (W Com) in spring 1998 The extraordinary optical outburst of ON 231 (W Com) in spring 1998

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342l..49m&link_type=abstract

Astronomy and Astrophysics, v.342, p.L49-L52 (1999)

Astronomy and Astrophysics

Astrophysics

22

Galaxies: Bl Lacertae Objects: General, Galaxies: Bl Lacertae Objects: Individual: On 231

Scientific paper

The BL Lac object ON 231 (1219+285, W Com) had an exceptional outburst phase in April-May 1998 and reached the most luminous state, observed at least since the beginning of the century. In this paper our multiband photometric light curves and polarimetric measurements of this event are presented. In the maximum phase the magnitude of ON 231 was R(Cousins)=12.2 and the optical spectral distribution was the flattest ever observed. Our data indicate that the main features of this burst can be explained by the presence of some emission components having different polarisation states and variability time scales ranging from 1 day to several months.

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