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Blazhko effect in Cepheids and RR Lyrae stars

Published online by Cambridge University Press:  18 February 2014

Róbert Szabó
Róbert Szabó*
Affiliation:
Konkoly Observatory, Research Center for Astronomy and Earth Sciences of the Hungarian Academy of SciencesKonkoly Thege Miklós út 15-17. H-1121, Budapest, Hungary email: szabo.robert@csfk.mta.hu
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Abstract

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The Blazhko effect is the conspicuous amplitude and phase modulation of the pulsation of RR Lyrae stars that was discovered in the early 20th century. The field of study of this mysterious modulation has recently been invigorated thanks to the space photometric missions providing long, uninterrupted, ultra-precise time-series data. In this paper I give a brief overview of the new observational findings related to the Blazhko effect, such as extreme modulations, irregular modulation cycles and additional periodicities. I argue that these findings together with dedicated ground-based efforts provide us now with a fairly complete picture and a good starting point to theoretical investigations. Indeed, new, unpredicted dynamical phenomena have been discovered in Blazhko RR Lyrae stars, such as period doubling, high-order resonances, three-mode pulsation and low-dimensional chaos. These led to the proposal of a new explanation to this century-old enigma, namely a high-order resonance between radial modes. Along these lines I present the latest efforts and advances from the theoretical point of view. Lastly, amplitude variations in Cepheids are discussed.

Keywords

stars: variables: RR Lyraestars: variables: CepheidsBlazhko effectstars: individual: RR LyrV445 LyrV473 Lyrα UMipulsationhydrodynamicsKepler
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 241 - 248
Copyright
Copyright © International Astronomical Union 2014 

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