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Blazhko effect and the Petersen diagram
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Pulsations in RR Lyrae stars and classical Cepheids were thought to be relatively simple since they typically pulsate only in one or two radial modes. This picture changes at a closer look when modulation or additional low-amplitude signals are detected. I will review different multi-periodic groups known among classical pulsators, including stars showing the Blazhko modulation.
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The VELOCE modulation zoo II. Humps and splitting patterns in spectral lines of classical Cepheids
Line splitting in Cepheids X Sgr and BG Cru is periodic on timescales of 12 and 3 days, ruling out pulsation-induced shocks and suggesting non-radial modes.
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