Discovery of Peculiar Double-Mode Pulsations and Period Doubling in KEPLER RRc Variables
Abstract
We analyzed the Long Cadence photometry of 4 first overtone RR Lyr-type stars (RRc stars) observed by the KEPLER telescope. All studied variables are multiperiodic. The strongest secondary peak appears for f2/f1 = 1.58-1.63, or P2/P1 = 0.61-0.63. In each star we detect at least one subharmonic of f2, either at ~1/2 f2 or at ~3/2 f2. The presence of subharmonics is a characteristic signature of a period doubling.
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