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We analyzed the Long Cadence photometry of 4 first overtone RR Lyr-type stars(RRc stars) observed by the KEPLER telescope. All studied variables aremultiperiodic. The strongest secondary peak appears for f_2/f_1 = 1.58-1.63, orP_2/P_1 = 0.61-0.63. In each star we detect at least one subharmonic of f_2,either at ~1/2 f_2 or at ~3/2 f_2. The presence of subharmonics is acharacteristic signature of a period doubling.

Discovery of Peculiar Double-Mode Pulsations and Period Doubling in KEPLER RRc Variables