The variability analysis of PKS 2155-304
Abstract
In this paper, the post-1977 photometric observations of PKS 2155-304 are compiled and used to discuss the variation periodicity. Largest amplitude variations (ΔU = 1m.5; ΔB = 1m.65; ΔV = 1m.85 ; ΔR = 1m.25; ΔI = 1m.14 ) and color indices ((B-V) = 0.30 0.06; (U-B) = -0.72 0.08; (B-R) = 0.62 0.07; (V-R) = 0.32 0.04) are found. The Jurkevich's method and DCF (Discrete Correlation Function) method indicate possible periods of 4.16-year and 7.0-year in the V light curve.
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