Discovery of Peculiar Double-Mode Pulsations and Period Doubling in KEPLER RRc Variables
Moskalik, P. Smolec, R. Kolenberg, Katrien Nemec, J. Kunder, A. Chadid, M. Kopacki, G. Szabó, R. KASC WG#13 members (KEPLER - RR Lyrae Stars)
Stellar Pulsations: Impact of New Instrumentation and New Insights pages:291-292
Astrophyiscs & Space Science Proceedings
Stellar Pulsations Impact of New Instrumentation and New Insights; Stellar Pulsation Meeting edition:20 location:Granada, Spain date:5-9 September 2011
poster number 34
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 f_2/f_1 = 1.58-1.63, or P_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 a characteristic signature of a period doubling.