1999A&A...342L..49M

Query : 1999A&A...342L..49M

1999A&A...342L..49M - Astronomy and Astrophysics, volume 342L49-52 (1999/2-3)

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

MASSARO E., MAESANO M., MONTAGNI F., NESCI R., TOSTI G., FIORUCCI M., LUCIANI M., TAKALO L.O., SILLANPAEAE A., KATAJAINEN S., KEINAENEN P., PURSIMO T., VILLATA M., RAITERI C.M., DE FRANCESCO G., SOBRITO G., EFIMOV Yu.S. and SHAKHOVSKOY N.M.

Abstract (from CDS):

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.

Abstract Copyright: ∼

Journal keyword(s): galaxies: BL Lacertae objects: general - galaxies: BL Lacertae objects: individual: ON 231

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1
2 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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