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Paper: Changes of the Physical State in Semiregular Variables
Volume: 203, The Impact of Large-Scale Surveys on Pulsating Star Research, IAU Colloquium 176
Page: 117
Authors: Kiss, L. L.; Szabó, Gy.; Szatmáry, K.; Mattei, J. A.
Abstract: We present a progress report on a detailed analysis of long-term (70-90 years) visual observations for seven semiregular variables. Fundamental changes of the physical state (amplitude and/or frequency modulations, mode change and switching) are studied with conventional Fourier- and wavelet analyses. Besides two examples of repetitive mode changes we report a simple geometric model of a rotationally induced amplitude modulation in RY Ursae Majoris.
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