Finest light-curve details, physical parameters and period fluctuations of CoRoT RR Lyrae stars

J. Benkő, R. Szabó, A. Derekas, Sódor

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The CoRoT satellite supplied the scientific community with a huge data base of variable stars. Among them the RR Lyrae stars have intensively been discussed in numerous papers in the last few years, but the latest runs have not been checked to find RR Lyrae stars up to now. Our main goal was to fill this gap and complete the CoRoT RR Lyrae sample. We found nine unstudied RR Lyrae stars. Seven of them are new discoveries. We identified three new Blazhko stars. The Blazhko effect shows non-strictly repetitive nature for all stars. The frequency spectrum of the Blazhko star CoRoT 104948132 contains second overtone frequency with the highest known period ratio. The harmonic amplitude and phase declines with the harmonic order were studied for non-Blazhko stars. We found a period dependent but similar shape amplitude decline for all stars. We discovered significant random period fluctuation for one of the two oversampled target, CM Ori. After a successful transformation of the CoRoT band parameters to the Johnson V values we estimated the basic physical properties such as mass, luminosity, metallicity. The sample can be divided into two subgroups with respect to the metallicity but otherwise the physical parameters are in the canonical range of RR Lyrae stars.

Original languageEnglish
Pages (from-to)1769-1779
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number2
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • Space vehicles
  • Stars: interiors
  • Stars: oscillations
  • Stars: variables: RR Lyrae
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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