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Paper: Low-Amplitude Periodicities and Modulations in Classical Pulsators
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 287
Authors: Smolec, R.
Abstract: We review the recent ground-based and space observations that revolutionized our view on classical pulsators. In RR Lyrae stars, classical Cepheids, and type II Cepheids, additional low-amplitude periodicities that cannot be interpreted as due to radial pulsation were discovered. A few new groups of double-periodic variables emerged in the Petersen diagram. Low-amplitude periodic modulations were also detected in all groups of classical pulsators. Many of the detected phenomena pose a new puzzle to the stellar pulsation theory.
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