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

Open Access

Fig. 23

Petersen diagram for RR_0.61 stars together with theoretical models for RR Lyrae stars calculated with the Warsaw envelope code (Dziembowski 1977). Only the highest amplitude additional signals (black symbols) are plotted for the RR_0.61 stars. For the modeled period ratios, we used the first harmonics of nonradial modes of the given degrees.

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