A NEW APPROACH TO THE ANALYSIS OF LIGHT CURVES OF PULSATING RR LYRAE STARS WITH THE BLAZHKO EFFECT

Abstract

We discuss the new approach for the analysis of the long-term dense series of observations of RR Lyr-type pulsating stars with the Blazhko effect. The standard way, namely The frequency analysis of the O–C values for the times of maxima does not allow for to detection of the complex nature of the periodic changes in the shape of the light curves, including bi-cyclicity. We have shown the perspectives of a new approach on the example of the analysis of FISge variable observations containing a total of 55 observational nights during a period of five years (AZT-3 Telescope, Mayaki Observational Station, SRI “Astronomical Observatory”, I. I. Mechnikov ONU). The study is based on the data obtained by S. N. Udovichenko during the 2013 and 2014 observational seasons as well as on data obtained by S. N. Udovichenko and the author during the 2018 observational season. Our results show that in order to understand the features in the shape of the light curve variations for RR Lyr type pulsating stars with the Blazhko effect, it is necessary to have data for full cycles of variability over a long time, and not just the moments of maxima.