Frequency analysis of the first-overtone RR Lyrae stars based on Extended Aperture Photometry from K2 data

Open Access

Fig. 3

Amplitude (blue) and phase (red) changes over time in two stars with detection of signals close to the first-overtone frequency. Top panel: amplitude and phase changes of EPIC 248553635. This star was classified as Blazhko. Bottom panel: amplitude and phase changes of EPIC 212595129. This star was not classified as Blazhko.

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