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2009MNRAS.394.1649M - Mon. Not. R. Astron. Soc., 394, 1649-1666 (2009/April-2)
Frequency analysis of Cepheids in the Large Magellanic Cloud: new types of classical Cepheid pulsators.
MOSKALIK P. and KOLACZKOWSKI Z.
Abstract (from CDS):
In 19 per cent of double-mode Cepheids pulsating in the first two radial overtones (FO/SO type), we have detected a Blazhko-type periodic modulation of amplitudes and phases. Both modes are modulated with a common period, which is always longer than 700 d. Variations of the two amplitudes are anticorrelated, and maximum of one amplitude always coincides with minimum of the other. We have compared observations of modulated FO/SO Cepheids with predictions of theoretical models of the Blazhko effect, showing that the currently most popular models cannot account for properties of these stars. We propose that the Blazhko effect in FO/SO Cepheids can be explained by a non-stationary resonant interaction of one of the radial modes with another, perhaps non-radial, mode of oscillations.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): methods: data analysis - stars: oscillations - Cepheids - Magellanic Clouds
Simbad objects: 111
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