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Long-Term Optical Behavior of BL Lac Objects

Published online by Cambridge University Press:  19 July 2016

S. Kikuchi
S. Kikuchi*
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan

Abstract

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On the basis of results of optical photometry and polarimetry of OJ287 and Mrk421 since 1981, we find two states of activities for both objects. In OJ287, a color-magnitude relation which is consistent with the standard jet-shock model is seen after the outburst in 1983, while before 1982 the optical colors were almost constant. In Mrk421, the colors became redder in 1985–87, and the change of the preferred direction of polarization was associated on smaller time scale in 1987.

Type
Poster Contributions: Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 394
Copyright
Copyright © Kluwer 1994 

References

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