CCD photometry and long-term optical variability of PKS 2155-304.

Details CCD photometry and long-term optical variability of PKS 2155-304. CCD photometry and long-term optical variability of PKS 2155-304.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..116..289z&link_type=abstract

Astronomy and Astrophysics Supplement, v.116, p.289-293

Astronomy and Astrophysics

Astrophysics

12

Bl Lacertae Objects: General Individual (Pks 2155-04)

Scientific paper

The paper presents the first evidence for long-term optical variability and colour behaviour of the X-ray-selected BL Lacertae object PKS 2155-304, which is the first example of its class. Our results show that the amplitude of the optical variations of PKS 2155-304 has been only about 1.4 magnitudes from its photometric history; no significant correlation between brightness and colours is found for PKS 2155-304. Our recent CCD photometry of PKS 2155-304 during September-October 1993 and July 1994 showed that it was the same brightness state as that in November 1991 (Smith et al. 1992).

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