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Wavelet Analysis of Some Pulsating Stars

Published online by Cambridge University Press:  12 April 2016

Károly Szatmáry  and
János Gál
Károly Szatmáry
Affiliation:
Dept. of Exp. Physics, JATE UniversityH-6720 Szeged, Dóm tér 9, Hungary
János Gál
Affiliation:
Dept. of Exp. Physics, JATE UniversityH-6720 Szeged, Dóm tér 9, Hungary

Extract

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The detection of a variable period is very important as it gives information on the evolutionary state or on the binary nature of a pulsating star. If a pulsator is moving in a binary system, its light curve is frequency-modulated by the orbital period (light-time effect). Mode switching or chaos also may be the cause of the changes in the amplitude and period of the light variations.

The determination of period variability is difficult. Usually the conventional Fourier-spectrum cannot give any information about a possible period variation. The 0-C diagram is useful to detect a variable period, but it does not give the amplitude and phase values.

Type
VIII. Asteroseismology: observation
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 761 - 763
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Goupil, M.J., Auvergne, M. and Baglin, A. 1990, In Confrontation between Stellar Pulsation and Evolution, ed. Cacciari, C. and Clementini, G., Astron. Soc. of the Pacific, Conf. Series Vol. 11, p. 578. Google Scholar
Grossmann, A., Kronland-Martinet, R. and Morlet, J. 1989, in Wavelets: Time-Frequency Methods and Phase Space, ed. Combes, J.M., Grossmann, A. and Tchamitchian, Ph., Springer, p.2.CrossRefGoogle Scholar
Szatmáry, K. and Vinkó, J. 1992, MNRAS (in press)Google Scholar