Abstract
The new time-resolved CCD photometry of XX Cyg was presented. We investigate the time-dependent behaviour of the light variations by reanalyzing the data in the literature. XX Cyg was demonstrated beyond any doubt again to be a monoperiodic pulsator. Its light curves can be well reproduced by the sinusoids with the fundamental frequency f 0 = 7.41481 ± 0.00001 cycle d-1(P 0 = 0d . 1348652 ± 0.0000001) and its first nine harmonics. Fourier, wavelet and O–C analyses based on all the available data reveals the amplitude and period variations during the years 1974 to 2000.The general trend of the amplitude changes is decreasing at a rate of one percent milli-magnitudes per year. The parabolic analysis on the updated 101 times of maximum light suggests a slowly continuous increasing at a rate of 1.3 × 10-3 days per million years in the period.
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