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New RR Lyrae variables in binary systems

Hajdu, G. and Catelan, M. and Jurcsik, J. and Dékány, I. and Drake, A. J. and Marquette, J.-B. (2015) New RR Lyrae variables in binary systems. Monthly Notices of the Royal Astronomical Society: Letters, 449 (1). L113-L117. ISSN 1745-3933.

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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 years, 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 8 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Catelan, M.0000-0001-6003-8877
Additional Information:© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 February 4. Received 2015 January 30; in original form 2015 January 8. Submitted on Feb 4 2015. G.H. acknowledges discussions with A. Tokovinin and K. He- lminiak. We also thank the referee for her/his helpful comments. Support for this project is provided by the Ministry for the Economy, Development, and Tourism’s Programa Iniciativa Cientıfica Milenio through grant IC 210009, awarded to the Millennium Institute of Astrophysics; by Proyecto Basal PFB-06/2007; by Fondecyt grant #1141141; and by CONICYT Anillo grant ACT 1101.
Funding AgencyGrant Number
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ACT 1101
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141141
Ministry for the Economy, Development, and Tourism’s Programa Iniciativa Cientıfica MilenioIC 210009
Non-Subject Keywords:binaries: general – methods: data analysis – stars: oscillations – stars: variables: RR Lyrae – techniques: photometric – stars: fundamental parameters
Issue or Number:1
Record Number:CaltechAUTHORS:20150209-043035312
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Official Citation:G. Hajdu, M. Catelan, J. Jurcsik, I. Dékány, A. J. Drake, and J.-B. Marquette New RR Lyrae variables in binary systems MNRAS (May 01, 2015) Vol. 449 L113-L117 doi:10.1093/mnrasl/slv024 First published online March 17, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54504
Deposited By: Joy Painter
Deposited On:09 Feb 2015 21:47
Last Modified:09 Mar 2020 13:18

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