Issue |
Astron. Astrophys. Suppl. Ser.
Volume 129, Number 3, May I 1998
|
|
---|---|---|
Page(s) | 569 - 575 | |
DOI | https://doi.org/10.1051/aas:1998204 | |
Published online | 15 May 1998 |
Microvariability of the blazar OJ 287*
Yunnan Observatory, Academia Sinica, P.O. Box 110, Kunming, Yunnan, P.R. China
Send offprint request to: G.B. Jia
Received:
2
February
1996
Accepted:
19
September
1997
Results of BVRI CCD photometric monitoring and fast photometry in the I band
for the blazar OJ 287 in 1994-1995 are presented. The predicted outburst of
the blazar had been observed, the maximum appeared in 1994 November, after
that, the luminosity decreased by 1.6 mag for about three months and dropped
to near the level in 1994 April. Rapid variations with timescales of
minutes, hours and one day were observed in our observations, with small
amplitude. The amplitude of the most rapid variations (minutes) is in the
range of 043-
12. The results of the statistical analysis of the
fast photometry data are as follows. In five nights out of six rapid
variability appeared in the sampling interval, which ranged from 3.4 minutes
to 6.5 minutes, with a rms amplitude of flux variations of
.
The rapid variability can be explained by the model of shocks within
turbulent jet or of vortices and magnetic flux tubes on accretion disk.
Key words: BL Lacertae objects: individual: OJ 287 / galaxies: active
© European Southern Observatory (ESO), 1998