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Paper: Amplitude Modulation in RR Lyrae Hydrodynamic Models
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 117
Authors: Kolláth, Z.
Abstract: Since the discovery of the amplitude modulation of RR Lyrae stars by Sergey Blazhko in 1907, there have been many attempts to explain this behavior. However, the origin of the phenomenon has remained a puzzle. Studies have linked the process behind the amplitude modulation to different effects, sometimes nonphysical mechanisms. Here for the first time, we present models showing that the pulsation dynamics itself, with no additional machinery, can lead to modulation of the amplitude with a similar fashion as the observations. The key is the interaction of the fundamental mode with the 9th (strange) mode, as predicted earlier. However, the interplay of these modes is concentrated in the outer layers of the star, which makes it hard to model the pulsation correctly. On the other hand, this surface behavior illuminates most of the observational results.
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