FM17p.18 — Long term light curve variations of the Kepler Cepheid V1154 Cyg: Is V1154 Cyg yet another one Blazhko effect Cepheid?

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Aug 10th at 6:00 PM until 6:00 PM

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Author(s): Evgeny Kanev1, Mikhail Sachkov1, Igor Savanov1

Institution(s): 1. INASAN

We present a period analysis of the light curve and its Fourier parameters of the bright Cepheid V1154 Cyg (P=4.925454 days) based on the observations by the Kepler space telescope and WASP data. Fourier parameters R21, R31 clearly indicate variations with a period of 158.2±1 days (more than 5� σ peak in the power spectrum) with a very small amplitude (0.265-0.275 for R21, 0.065-0.071 for R31) making impossible to detect it with groundbased observations. Finally we discuss that this effect is similar to the Blazhko effect in RR Lyrae stars.