Amplitude and phase changes in the light curves of long-period variables

Details Amplitude and phase changes in the light curves of long-period variables Amplitude and phase changes in the light curves of long-period variables

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.325.1383h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 4, pp. 1383-1388.

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Methods: Data Analysis: Methods: Statistical: Stars: Individual: T Cas: Stars: Oscillations: Stars: Variables: Other

Scientific paper

We describe the derivation of periodicities from visual data for long-period variables, and give expected errors for the derived amplitude, phase and frequency. We extend this analysis by using a moving window to deduce variation in phase and amplitude over time. The method is demonstrated on the Mira-type variable T Cas, and shows evidence that the phase of the first harmonic (period 222.4d) varies relative to the fundamental (period 444.8d) with a period of approximately 3000d. Our analysis parallels, but is completely independent of, the work of Szatmáry, Gál & Kiss and Bedding et al., who both use an approach based on wavelet analysis.

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