Result of the photometric study of the AGB stars in symbiotic binaries R Aql, V1329 Cyg, TX CVn, V1016 Cyg and UX Aur are presented. Extreme values and cycle lengths vary with time, their characteristics are tabulated. Time series and correlation analysis is made for the characteristics of the individual cycles. The light curves were smoothed by the method of "running parabolae". We propose a supplementary method of "running sines" which is more effective for the data with large gaps. For asymmetric curves it may be extended to a method of "running multi-harmonic fit". The statistical properties of these fits are studied on the observations of these stars and on analytical and numerical models. The mean curve is determined by multi-harmonic fit with determination of the number of statistically significant harmonics and correction of the period by differential corrections.
IAU Joint Discussion
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