New RR Lyrae variables in binary systems

G. Hajdu, M. Catelan, J. Jurcsik, I. Dékány, A. J. Drake, J. B. Marquette

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22 Citations (Scopus)


Despite their importance, very few RR Lyrae (RRL) stars have been known to reside in binary systems. We report on a search for binary RRL in the OGLE-III Galactic bulge data. Our approach consists in the search for evidence of the light-travel time effect in so-called observed minus calculated (O-C) diagrams. Analysis of 1952 well-observed fundamentalmode RRL in the OGLE-III data revealed an initial sample of 29 candidates. We used the recently released OGLE-IV data to extend the baselines up to 17 yr, leading to a final sample of 12 firm binary candidates. We provide O-C diagrams and binary parameters for this final sample, and also discuss the properties of eight additional candidate binaries whose parameters cannot be firmly determined at present. We also estimate that ≳4 per cent of the RRL reside in binary systems.

Original languageEnglish
Pages (from-to)L113-L117
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Publication statusPublished - Feb 18 2015


  • Binaries: general
  • Methods: data analysis
  • Stars: fundamental parameters
  • Stars: oscillations
  • Stars: variables: RR Lyrae
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Hajdu, G., Catelan, M., Jurcsik, J., Dékány, I., Drake, A. J., & Marquette, J. B. (2015). New RR Lyrae variables in binary systems. Monthly Notices of the Royal Astronomical Society: Letters, 449(1), L113-L117.