Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys

T. MURAVEVA+10 COAUTORES; A.E. PIATTI

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2014 vol. 443 p. 432 - 445

0035-8711

We present a catalogue of 1768 eclipsing binary stars (EBs) detected in the Large Mag-ellanic Cloud (LMC) by the second generation of the EROS survey (hereinafter EROS-2); 493 of them are new discoveries located in outer regions (out of the central bar)of the LMC. These sources were originally included in a list of candidate classicalCepheids (CCs) extracted from the EROS-2 catalogue on the basis of the period (0.89< PEROS <15.85 days) versus luminosity (13.39 < BEROS < 17.82 mag) diagram.After visual inspection of the light curves we reclassified them as eclipsingbinaries. They have blue colours (BEROS −REROS < 0.2 mag) hence we classedthem as hot eclipsing binaries (HEBs) containing hot massive components:main sequence (MS) stars or blue giants. We present Ks -band light curves for 999binaries from our sample that have a counterpart in the VISTA near-infrared ESO publicsurvey of the Magellanic Clouds system (VMC). We provide spectral classifications of 13HEBs with existing spectroscopy. We divided our sample into contact-like binaries anddetached/semi-detached systems based on both visual inspection and the parameters ofthe Fourier decomposition of the light curves and analysed the period-luminosity (P L)relations of the contact-like systems using the REROS and Ks magnitudes at maximumlight. The contact-like binaries in our sample do not follow P L relations. We analysedthe sample of contact binaries from the OGLE III catalogue and confirmed that P LI andP LKs sequences are defined only by eclipsing binaries containing a red giant component.