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 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.
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.Attached Files
Published - MNRAS-2015-Hajdu-L113-7.pdf
Submitted - 1502.01318v1.pdf
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Additional details
- Eprint ID
- 54504
- Resolver ID
- CaltechAUTHORS:20150209-043035312
- ACT 1101
- Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)
- 1141141
- Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
- IC 210009
- Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientıfica Milenio
- Created
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2015-02-09Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field