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Automated analysis of eclipsing binary light curves - II. Statistical analysis of OGLE LMC eclipsing binaries

Mazeh, T. and Tamuz, O. and North, P. (2006) Automated analysis of eclipsing binary light curves - II. Statistical analysis of OGLE LMC eclipsing binaries. Monthly Notices of the Royal Astronomical Society, 367 (4). pp. 1531-1542. ISSN 0035-8711. doi:10.1111/j.1365-2966.2006.10050.x.

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In the first paper of this series, we presented EBAS – Eclipsing Binary Automated Solver, a new fully automated algorithm to analyse the light curves of eclipsing binaries, based on the EBOP code. Here, we apply the new algorithm to the whole sample of 2580 binaries found in the Optical Gravitational Lensing Experiment (OGLE) Large Magellanic Cloud (LMC) photometric survey and derive the orbital elements for 1931 systems. To obtain the statistical properties of the short-period binaries of the LMC, we construct a well-defined subsample of 938 eclipsing binaries with main-sequence B-type primaries. Correcting for observational selection effects, we derive the distributions of the fractional radii of the two components and their sum, the brightness ratios and the periods of the short-period binaries. Somewhat surprisingly, the results are consistent with a flat distribution in log P between 2 and 10 d. We also estimate the total number of binaries in the LMC with the same characteristics, and not only the eclipsing binaries, to be about 5000. This figure leads us to suggest that (0.7 ± 0.4) per cent of the main-sequence B-type stars in the LMC are found in binaries with periods shorter than 10 d. This frequency is substantially smaller than the fraction of binaries found by small Galactic radial-velocity surveys of B stars. On the other hand, the binary frequency found by Hubble Space Telescope (HST) photometric searches within the late main-sequence stars of 47 Tuc is only slightly higher and still consistent with the frequency we deduced for the B stars in the LMC.

Item Type:Article
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URLURL TypeDescription Paper Data
Tamuz, O.0000-0002-0111-0418
Additional Information:© 2006 The Authors. Journal compilation © 2006 RAS. In original form 2005 September 26. Received 2005 November 30. Accepted 2006 January 9. First published online April 21, 2006. We are grateful to the OGLE team, and to L. Wyrzykowski in particular, for the excellent photometric data set and the eclipsing binary analysis that was available to us. We thank J. Devor, G. Torres and I. Ribas for very useful comments. The remarks and suggestions of the referee, T. Zwitter, helped us to substantially improve the algorithm and this paper. This work was supported by the Israeli Science Foundation through grant no. 03/233.
Funding AgencyGrant Number
Israel Science Foundation03/233
Subject Keywords:methods: data analysis binaries: eclipsing Magellanic Clouds
Issue or Number:4
Record Number:CaltechAUTHORS:20161109-163450950
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Official Citation:T. Mazeh, O. Tamuz, and P. North Automated analysis of eclipsing binary light curves – II. Statistical analysis of OGLE LMC eclipsing binaries MNRAS (2006) Vol. 367 1531-1542 doi:10.1111/j.1365-2966.2006.10050.x First published online April 21, 2006
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71902
Deposited By: George Porter
Deposited On:17 Nov 2016 21:04
Last Modified:11 Nov 2021 04:53

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