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Astron. Astrophys. 355, 880-884 (2000)

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Research Note

The variability analysis of PKS 2155-304

J.H. Fan 1,2 and R.G. Lin 1

1 Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, P.R. China (jhfan@guangztc.edu.cn)
2 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center (CAS-PKU.BAC), Beijing, P.R. China

Received 9 July 1998 / Accepted 10 September 1999


In this paper, the post-1977 photometric observations of PKS 2155-304 are compiled and used to discuss the variation periodicity. Largest amplitude variations ([FORMULA]; [FORMULA]; [FORMULA]; [FORMULA]; [FORMULA]) and color indices ([FORMULA]; [FORMULA]; [FORMULA]; [FORMULA]) are found. The Jurkevich's method and DCF (Discrete Correlation Function) method indicate possible periods of 4.16-years and 7.0-years in the V light curve.

Key words: galaxies: BL Lacertae objects: individual: PKS 2155-304

© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000