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Title:
Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars
Authors:
Szabó, R.; Kolláth, Z.; Molnár, L.; Kolenberg, K.; Kurtz, D. W.; Bryson, S. T.; Benko, J. M.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Borucki, W. J.; Koch, D.; Twicken, J. D.; Chadid, M.; di Criscienzo, M.; Jeon, Y.-B.; Moskalik, P.; Nemec, J. M.; Nuspl, J.
Affiliation:
AA(Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary), AB(Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary), AC(Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary), AD(Institut für Astronomie, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria), AE(Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston PR1 2HE), AF(NASA Ames Research Center, MS 244-30, Moffet Field, CA 94035, USA), AG(Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary), AH(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AI(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AJ(NASA Ames Research Center, MS 244-30, Moffet Field, CA 94035, USA), AK(NASA Ames Research Center, MS 244-30, Moffet Field, CA 94035, USA), AL(SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA), AM(Observatoire de la Côte d'Azur, Université Nice, Sophia-Antipolis, UMR 6525, parc Valrose, 06108 Nice Cedex 02, France), AN(INAF-Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone, Roma, Italy), AO(Korea Astronomy and Space Institute, Daejeon 305-346, Korea), AP(Copernicus Astronomical Center, ul. Bartycka 18, 00-716, Warsaw, Poland), AQ(Department of Physics and Astronomy, Camosun College, Victoria, British Columbia, V8P 5J2, Canada), AR(Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 409, Issue 3, pp. 1244-1252. (MNRAS Homepage)
Publication Date:
12/2010
Origin:
WILEY
Astronomy Keywords:
stars: individual: RR Lyrae, stars: individual: V808 Cyg, stars individual: V355 Lyr, stars: oscillations, stars: variables: RR Lyrae
Abstract Copyright:
© 2010 The Authors. Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.17386.x
Bibliographic Code:
2010MNRAS.409.1244S

Abstract

The first detection of the period doubling phenomenon is reported in the Kepler RR Lyrae stars RR Lyr, V808 Cyg and V355 Lyr. Interestingly, all these pulsating stars show Blazhko modulation. The period doubling manifests itself as alternating maxima and minima of the pulsational cycles in the light curve, as well as through the appearance of half-integer frequencies located halfway between the main pulsation period and its harmonics in the frequency spectrum. The effect was found to be stronger during certain phases of the modulation cycle. We were able to reproduce the period-doubling bifurcation in our non-linear RR Lyrae models computed by the Florida-Budapest hydrocode. This enabled us to trace the origin of this instability in RR Lyrae stars to a resonance, namely a 9:2 resonance between the fundamental mode and a high-order (ninth) radial overtone showing strange-mode characteristics. We discuss the connection of this new type of variation to the mysterious Blazhko effect and argue that it may give us fresh insights into solving this century-old enigma.
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