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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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.