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Kepler RR Lyrae stars: beyond period doubling

Published online by Cambridge University Press:  18 February 2014

L. Molnár ,
J. M. Benkő ,
R. Szabó  and
Z. Kolláth
L. Molnár
Affiliation:
Konkoly Observatory, MTA CSFK H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary email: molnar.laszlo@csfk.mta.hu Institute of Mathematics and Physics, Savaria Campus, University of West Hungary H-9700 Szombathely, Károlyi Gáspár tér 4, Hungary
J. M. Benkő
Affiliation:
Konkoly Observatory, MTA CSFK H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary email: molnar.laszlo@csfk.mta.hu
R. Szabó
Affiliation:
Konkoly Observatory, MTA CSFK H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary email: molnar.laszlo@csfk.mta.hu
Z. Kolláth
Affiliation:
Konkoly Observatory, MTA CSFK H-1121 Konkoly Thege Miklós út 15-17, Budapest, Hungary email: molnar.laszlo@csfk.mta.hu Institute of Mathematics and Physics, Savaria Campus, University of West Hungary H-9700 Szombathely, Károlyi Gáspár tér 4, Hungary
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Abstract

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We examined the complete short cadence sample of fundamental-mode Kepler RR Lyrae stars to further investigate the recently discovered dynamical effects such as period doubling and additional modes. Here we present the findings on four stars. V450 Lyr may be a non-classical double-mode RR Lyrae star pulsating in the fundamental mode and the second overtone. For the three remaining stars we observe the interaction of three different modes. Since the period ratios are close to resonant values, we observe quasi-repetitive patterns in the pulsation cycles in the stars. These findings support the mode-resonance explanations of the Blazhko effect.

Keywords

stars: variable: RR LyraeKepler
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 459 - 460
Copyright
Copyright © International Astronomical Union 2014 

References

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Molnár, L., Kolláth, Z., Szabó, R., et al. 2012, ApJ, 757, L13Google Scholar
Nowakowski, R. M. & Dziembowski, W. A. 2001, AcA, 51, 5Google Scholar