Multi-Periodic Oscillations in Cepheids and RR Lyrae-Type Stars [PDF]
P. MoskalikClassical Cepheids and RR Lyrae-type stars are usually considered to be textbook examples of purely radial, strictly periodic pulsators. Not all the variables, however, conform to this simple picture. In this review I discuss different forms of multi-periodicity observed in Cepheids and RR Lyrae stars, including Blazhko effect and various types of radial and nonradial multi-mode oscillations.View original: http://arxiv.org/abs/1208.4246
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