BVR_cI_c monitoring of ON 231 during the great outburst in 1994-1997

Details BVR_cI_c monitoring of ON 231 during the great outburst in 1994-1997 BVR_cI_c monitoring of ON 231 during the great outburst in 1994-1997

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..130..109t&link_type=abstract

Astronomy and Astrophysics Supplement, v.130, p.109-115

Astronomy and Astrophysics

Astrophysics

28

Bl Lacertae Objects: General, Individual, On231

Scientific paper

We present the most continuous data base of optical multiband data ever published on the BL Lacertae object ON 231 (W Com). The data have been collected during an intensive and coordinated BVR_cI_c monitoring campaign carried out in the period from March 1994 to March 1997. During our campaign, the source brightness was at the highest level ever observed. The light curve shows a complex structure, characterized by the presence of three major outbursts having the observed maxima in March 1995, February 1996, and January 1997, when ON 231 reached its historical maximum (B =~ 14.2). Variability on time scales from a few hours up to a month have frequently been observed and the light curve seems to be the superposition of many flares with different amplitudes and time scales. The broad-band optical spectral energy distribution is characterized by a spectral slope which correlates with the flux level. In particular, the higher is the flux the flatter is the spectrum. Table 2 is only available in electronic form at the CDS via anonymous ftp 130.79.128.5 or via http://cdsweb.u-strasbg.fr/Abstract.html

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