Gaia Data Release 2 - Validating the classification of RR Lyrae and Cepheid variables with the Kepler and K2 missions

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Fig. 3

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Fourier parameters of the light curves of cross-matched K2–Gaia RR Lyrae-type sources. The ith and the first Fourier harmonics are compared by the , relative phase differences (in radians, using cosine-based Fourier fits) and the R₂₁, R₃₁ amplitude ratios, as a function of the periods (P). The colour-coding shows the respective and pairs. Triangles show RRc stars, dots represent RRab stars, and crosses show potential anomalous Cepheid stars (see Sect. 4.2.2).

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