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Characterization of 9380 contact binaries from the CRTS Variable Sources Catalogue

Marsh, F. M. and Prince, T. A. and Mahabal, A. A. and Bellm, E. C. and Drake, A. J. and Djorgovski, S. G. (2017) Characterization of 9380 contact binaries from the CRTS Variable Sources Catalogue. Monthly Notices of the Royal Astronomical Society, 465 (4). pp. 4678-4689. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20170331-095838217

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Abstract

We construct a sample of 9380 contact binaries (W UMa systems) by using the Catalina Real-Time Transient Survey Variables Sources Catalogue. By measuring brightness change rates, light-curve statistics, and temperatures for this sample, we improve the understanding of contact binary light-curve characteristics, and luminosity variability on decadal time-scales. We show that binaries with convective outer envelopes have a different distribution of light-curve amplitudes and magnitude differences between eclipse minima than binaries with radiative outer envelopes. We find that more than 2000 binaries exhibit a linear change in mean brightness over the 8-yr timespan of observations with at least 3σ significance. We note that 25.9 per cent of binaries with convective outer envelopes exhibit a significant change in brightness, while only 10.5 per cent of radiative binaries exhibit a significant change in brightness. In 205 binaries (2.2 per cent), we find that a sinusoid model better describes the luminosity trend within the 8-yr observation timespan. For these binaries, we report the amplitudes and periods (as estimated using observed half-periods) of this sinusoidal brightness variation and discuss possible mechanisms driving the variation.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stw2110DOIArticle
https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2110PublisherArticle
ORCID:
AuthorORCID
Prince, T. A.0000-0002-8850-3627
Mahabal, A. A.0000-0003-2242-0244
Bellm, E. C.0000-0001-8018-5348
Djorgovski, S. G.0000-0002-0603-3087
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 August 19. Received 2016 August 18; in original form 2016 June 20. This work made use of data products from the CSS survey. The CSS survey is funded by the National Aeronautics and Space Administration under Grant No. NNG05GF22G issued through the Science Mission Directorate Near-Earth Objects Observations Program. The CRTS survey is supported by the US National Science Foundation under grants AST-0909182, AST-1313422, AST-1413600, and AST-1518308. This work made use of data products from the SDSS-III survey. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. I would like to acknowledge the California Institute of Technology Summer Undergraduate Research Fellowship program for their financial support. I thank an anonymous reviewer for providing comments which greatly improved the paper. I thank James Davenport and Lynne Hillenbrand for their helpful comments, Jake VanderPlas for his help with gatspy, and John McBride for his help preparing the manuscript.
Group:Palomar Transient Factory
Funders:
Funding AgencyGrant Number
NASANNG05GF22G
NSFAST-0909182
NSFAST-1313422
NSFAST-1413600
NSFAST-1518308
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Subject Keywords:surveys, binaries: eclipsing, stars: magnetic field
Issue or Number:4
Record Number:CaltechAUTHORS:20170331-095838217
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170331-095838217
Official Citation:F. M. Marsh, T. A. Prince, A. A. Mahabal, E. C. Bellm, A. J. Drake, S. G. Djorgovski; Characterization of 9380 contact binaries from the CRTS Variable Sources Catalogue. Mon Not R Astron Soc 2017; 465 (4): 4678-4689. doi: 10.1093/mnras/stw2110
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75572
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:31 Mar 2017 17:16
Last Modified:26 Nov 2019 11:15

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