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A modulated RRd star observed by K2
Emese Plachy (Konkoly Observatory, MTA CSFK), László Molnár (Konkoly Observatory, MTA CSFK), Péter Klagyivik (Konkoly Observatory, MTA CSFK), Róbert Szabó (Konkoly Observatory, MTA CSFK)
We report the analysis of the double-mode RR Lyrae star EPIC 205209951, the first modulated RRd star observed from space. The amplitude and phase modulation are present in both modes and operate in opposite phases. The star was previously known as a strongly modulated RRab star: data from ground-based surveys revealed only the modulated fundamental mode that reaches higher amplitudes than the first overtone.