Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars

R. Szabó; Z. Kolláth; L. Molnár; K. Kolenberg; D. W. Kurtz; S. T. Bryson; J. M. Benko; J. Christensen-Dalsgaard; H. Kjeldsen; W. J. Borucki; D. Koch; J. D. Twicken; M. Chadid; M. Di Criscienzo; Y. B. Jeon; P. Moskalik; J. M. Nemec; J. Nuspl

doi:10.1111/j.1365-2966.2010.17386.x

Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars

R. Szabó, Z. Kolláth, L. Molnár, K. Kolenberg, D. W. Kurtz, S. T. Bryson, J. M. Benko, J. Christensen-Dalsgaard, H. Kjeldsen, W. J. Borucki, D. Koch, J. D. Twicken, M. Chadid, M. Di Criscienzo, Y. B. Jeon, P. Moskalik, J. M. Nemec, J. Nuspl

Research output: Contribution to journal › Article

100 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1244-1252
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	409
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2010.17386.x
Publication status	Published - Dec 1 2010

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Keywords

Stars individual: V355 Lyr
Stars: individual: RR Lyrae
Stars: individual: V808 Cyg
Stars: oscillations
Stars: variables: RR Lyrae

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Cite this

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. (2010). Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars. Monthly Notices of the Royal Astronomical Society, 409(3), 1244-1252. https://doi.org/10.1111/j.1365-2966.2010.17386.x

Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars. / 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 409, No. 3, 01.12.2010, p. 1244-1252.

Research output: Contribution to journal › Article

Szabó, R , Kolláth, Z, Molnár, L, Kolenberg, K, Kurtz, DW, Bryson, ST, Benko, JM, Christensen-Dalsgaard, J, Kjeldsen, H, Borucki, WJ, Koch, D, Twicken, JD, Chadid, M, Di Criscienzo, M, Jeon, YB, Moskalik, P, Nemec, JM & Nuspl, J 2010, 'Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars', Monthly Notices of the Royal Astronomical Society, vol. 409, no. 3, pp. 1244-1252. https://doi.org/10.1111/j.1365-2966.2010.17386.x

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. / Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars. In: Monthly Notices of the Royal Astronomical Society. 2010 ; Vol. 409, No. 3. pp. 1244-1252.

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10.1111/j.1365-2966.2010.17386.x