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Changes of the Physical State in Semiregular Variables

Published online by Cambridge University Press:  12 April 2016

L. L. Kiss ,
Gy. Szabó ,
K. Szatmáry  and
J. A. Mattei
L. L. Kiss
Affiliation:
Department of Experimental Physics & Astronomical Observatory, JATE University, H-6720 Szeged, Dóm tér 9., Hungary
Gy. Szabó
Affiliation:
Department of Experimental Physics & Astronomical Observatory, JATE University, H-6720 Szeged, Dóm tér 9., Hungary
K. Szatmáry
Affiliation:
Department of Experimental Physics & Astronomical Observatory, JATE University, H-6720 Szeged, Dóm tér 9., Hungary
J. A. Mattei
Affiliation:
AAVSO, 25 Birch Street, Cambridge MA02138-1205, USA

Abstract

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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.

Type
Part 2. Variability of High-Luminosity Stars
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 117 - 118
Copyright
Copyright © Astronomical Society of the Pacific 2000

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