Kepler photometry of the prototypical Blazhko star RR Lyr: An old friend seen in a new light

K. Kolenberg, S. Bryson, R. Szabó, D. W. Kurtz, R. Smolec, J. M. Nemec, E. Guggenberger, P. Moskalik, J. Benkő, M. Chadid, Y. B. Jeon, L. L. Kiss, G. Kopacki, J. Nuspl, M. Still, J. Christensen-Dalsgaard, H. Kjeldsen, W. J. Borucki, D. A. Caldwell, J. M. JenkinsD. Koch

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

We present our analysis of the long-cadence Kepler data for the well-studied Blazhko star RR Lyr, gathered during the first two quarters of the satellite's observations and covering a total of 127d. Besides being of great importance for our understanding of RR Lyrae stars in general, these RR Lyr data can be regarded as a case study for observations of bright stars with Kepler. Kepler can perform high-precision photometry on targets like RR Lyr, as the saturated flux is conserved to a very high degree. The Kepler data on RR Lyr are revolutionary in several respects. Even with long-cadence sampling (one measurement per 29.4min), the unprecedented precision (<mmag) of the Kepler photometry allows the study of the star's extreme light-curve variations in detail. The multiplet structures at the main frequency and its harmonics, typical for Blazhko stars, are clearly detected up to the quintuplets. For the first time, photometric data of RR Lyr reveal the presence of half-integer frequencies, linked to a period-doubling effect. This phenomenon may be connected to the still unexplained Blazhko modulation. Moreover, with three observed Blazhko cycles at our disposal, we observe that there is no exact repetition in the light-curve changes from one modulation cycle to the next for RR Lyr. This may be due to additional periodicities in the star, or to transient or quasi-periodic changes.

Original languageEnglish
Pages (from-to)878-890
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume411
Issue number2
DOIs
Publication statusPublished - Feb 2011

Fingerprint

photometry
stars
light curve
periodicity
modulation
cycles
period doubling
satellite observation
disposal
integers
periodic variations
repetition
sampling
coverings
fine structure
harmonics

Keywords

  • Stars: horizontal branch
  • Stars: individual: KIC7198959
  • Stars: individual: RR Lyr
  • Stars: oscillations
  • Stars: variables: RR Lyrae
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Kepler photometry of the prototypical Blazhko star RR Lyr : An old friend seen in a new light. / Kolenberg, K.; Bryson, S.; Szabó, R.; Kurtz, D. W.; Smolec, R.; Nemec, J. M.; Guggenberger, E.; Moskalik, P.; Benkő, J.; Chadid, M.; Jeon, Y. B.; Kiss, L. L.; Kopacki, G.; Nuspl, J.; Still, M.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Borucki, W. J.; Caldwell, D. A.; Jenkins, J. M.; Koch, D.

In: Monthly Notices of the Royal Astronomical Society, Vol. 411, No. 2, 02.2011, p. 878-890.

Research output: Contribution to journalArticle

Kolenberg, K, Bryson, S, Szabó, R, Kurtz, DW, Smolec, R, Nemec, JM, Guggenberger, E, Moskalik, P, Benkő, J, Chadid, M, Jeon, YB, Kiss, LL, Kopacki, G, Nuspl, J, Still, M, Christensen-Dalsgaard, J, Kjeldsen, H, Borucki, WJ, Caldwell, DA, Jenkins, JM & Koch, D 2011, 'Kepler photometry of the prototypical Blazhko star RR Lyr: An old friend seen in a new light', Monthly Notices of the Royal Astronomical Society, vol. 411, no. 2, pp. 878-890. https://doi.org/10.1111/j.1365-2966.2010.17728.x
Kolenberg, K. ; Bryson, S. ; Szabó, R. ; Kurtz, D. W. ; Smolec, R. ; Nemec, J. M. ; Guggenberger, E. ; Moskalik, P. ; Benkő, J. ; Chadid, M. ; Jeon, Y. B. ; Kiss, L. L. ; Kopacki, G. ; Nuspl, J. ; Still, M. ; Christensen-Dalsgaard, J. ; Kjeldsen, H. ; Borucki, W. J. ; Caldwell, D. A. ; Jenkins, J. M. ; Koch, D. / Kepler photometry of the prototypical Blazhko star RR Lyr : An old friend seen in a new light. In: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 411, No. 2. pp. 878-890.
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AU - Christensen-Dalsgaard, J.

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