Revisiting the Kepler non-Blazhko RR Lyrae sample: Cycle-to-cyle variations and additional modes

J. Benkő, J. Jurcsik, Aliz Derekas

Research output: Contribution to journalArticle

Abstract

We analysed the long-and short-cadence light curves of the Kepler non-Blazhko RRab stars. We prepared the Fourier spectra, the Fourier amplitude and phase variation functions, time-frequency representation, the O-C diagrams and their Fourier contents. Our main findings are: (i) All stars which are brighter than a certain magnitude limit show significant cycle-to-cycle light-curve variations. (ii) We found permanently excited additional modes for at least one-third of the sample and some other stars show temporarily excited additional modes. (iii) The presence of the Blazhko effect was carefully checked and identified one new Blazhko candidate but for at least 16 stars the effect can be excluded. This fact has important consequences. The cycle-to-cycle variation phenomenon is independent from the Blazhko effect and the Blazhko incidence ratio is still much lower (51-55 per cent) than the extremely large (>90 per cent) ratio published recently. The connection between the extra modes and the cycle-to-cycle variations is marginal.

Original languageEnglish
Pages (from-to)5897-5913
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number4
DOIs
Publication statusPublished - Mar 13 2019

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cycles
stars
light curve
diagram
time functions
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incidence
diagrams

Keywords

  • methods: data analysis
  • space vehicles
  • stars: oscillations
  • stars: variables: RR Lyrae

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Revisiting the Kepler non-Blazhko RR Lyrae sample : Cycle-to-cyle variations and additional modes. / Benkő, J.; Jurcsik, J.; Derekas, Aliz.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, No. 4, 13.03.2019, p. 5897-5913.

Research output: Contribution to journalArticle

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