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

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