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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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