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New RR Lyrae variables in binary systems.

Abstract : 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 fundamental-mode 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.
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G. Hajdu, M. Catelan, J. Jurcsik, I. Dekany, A. J. Drake, et al.. New RR Lyrae variables in binary systems.. Mon. Not. R. Astron. Soc., 2015, 449, pp.L113-L117. ⟨10.1093/mnrasl/slv024⟩. ⟨insu-03644972⟩

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