V. A. Hagen-Thorn*, S. G. Marchenko*, O. V. Mikolaichuk**, and V. A. Yakovleva*
* St. Petersburg State University, Bibliotechnaya pl. 2, Petrodvorets, 198904 Russia
** Pedagogical Institute, Sterlitamak, Bashkortostan, Russia
Received January 9, 1996
Abstract—Periodicity analysis of nonuniform time series by means of a “whitening” method is described.
Themethod is applied to a master light curve for the active galaxy 3C 120 for the period 1967–1989. This light
curve has a two-component structure, with a long-timescale component with period 15 years and a noise com-
ponent that resembles white noise. The study of separate intervals of the observational series shows that the
amplitude of the 15-year component is time-dependent.
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