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Blazhko Effect in Double Mode Cepheids

Published online by Cambridge University Press:  15 August 2009

M. Goupil ,
Z. Kolláth ,
N. Nardetto ,
P. Kervella ,
P. Moskalik  and
Z. Kołaczkowski
P. Moskalik
Affiliation:
Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
Z. Kołaczkowski
Affiliation:
Universidad de Concepcion, Departamento de Fisica, Casilla 160-C, Concepcion, Chile
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Abstract

Systematic survey for multiperiodicity in the LMC Cepheids(Moskalik et al. 2004, IAU Coll. 193, ASP Conf. Ser., 310, 498 and Mem. Soc. Astron. Ital., 77, 563)has led to discovery of several new forms of pulsationalbehaviour. One of them is periodic amplitude and phase modulationobserved in many first/second overtone (FO/SO) double modeCepheids. In the current paper we present detailed discussion ofthis newly discovered phenomenon, based on a combined OGLE+ MACHOsample of double mode pulsators.

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