Eclipsing binaries in the MACHO database: New periods and classifications for 3031 systems in the Large Magellanic Cloud

Abstract

Eclipsing binaries offer a unique opportunity to determine fundamental physical parameters of stars using the constraints on the geometry of the systems. Here we present a reanalysis of publicly available two-color observations of about 6800 stars in the Large Magellanic Cloud, obtained by the MACHO project between 1992 and 2000 and classified as eclipsing variable stars. Of these, less than half are genuine eclipsing binaries. We determined new periods and classified the stars, 3031 in total, using the Fourier parameters of the phased light curves. The period distribution is clearly bimodal, reflecting refer to the separate groups of more massive blue main sequence objects and low mass red giants. The latter resemble contact binaries and obey a period-luminosity relation. Using evolutionary models, we identified foreground stars. The presented database has been cleaned of artifacts and misclassified variables, thus allowing searches for apsidal motion, tertiary components, pulsating stars in binary systems and secular variations with time-scales of several years.

11 figures, 9 pages, accepted for publication in ApJ

References in corpus (20)

• Eclipsing binaries in ASAS catalog
• The Distance to the Large Magellanic Cloud from the Eclipsing Binary HV2274
• Calibration of the MACHO Photometry Database
• The MACHO Project 9 Million Star Color-Magnitude Diagram of the Large Magellanic Cloud
• Solutions for 10,000 Eclipsing Binaries in the Bulge Fields of OGLE II Using DEBiL
• Eclipsing Binaries in the OGLE Variable Star Catalog.I. W UMa-type Systems as Distance and Population Tracers in Baade's Window
• Automated analysis of eclipsing binary lightcurves. I. EBAS -- a new Eclipsing Binary Automated Solver with EBOP
• Ellipsoidal Variability and Long Secondary Periods in MACHO Red Giant Stars
• Photometric Solutions for Detached Eclipsing Binaries: selection of ideal distance indicators in the SMC
• Fundamental Properties and Distances of LMC Eclipsing Binaries: III. EROS 1044
• Eclipsing Binaries in the OGLE Variable Star Catalog.II. Light Curves of the W UMa-type Systems in Baade's Window
• Stellar Evolutionary Models for Magellanic Clouds
• The LMC eclipsing binary HV 2274: fundamental properties and comparison with evolutionary models
• Red variables in the OGLE-II data base -- III. Constraints on the three-dimensional structures of the LMC and SMC
• Eclipsing Binaries in the OGLE Variable Star Catalog.III. Long-Period Contact Systems
• Automated analysis of eclipsing binary lightcurves with EBAS. II. Statistical analysis of OGLE LMC eclipsing binaries
• Detached binaries in the Large Magellanic Cloud. A selection of binaries suitable for distance determination
• Eclipsing Binaries in the OGLE Variable Star Catalog. IV. The Pre-Contact, Equal-Mass Systems
• An empirical method to estimate the LMC distance using B-stars in eclipsing binary systems
• Eclipsing Binaries in the OGLE Variable Star Catalogs.V. Long-Period Beta Lyrae-type Systems in the Small Magellanic Cloud and the PLC-beta Relation

Cited by in corpus (25)

• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• Eclipse Timing Variation Analyses of Eccentric Binaries with Close Tertiaries in the Kepler field
• Observational Evidence for Tidal Interaction in Close Binary Systems
• Physical parameters of 62 eclipsing binary stars using the ASAS-3 data$-$I
• KIC 8410637: a 408-day period eclipsing binary containing a pulsating red giant
• Photometric and Spectroscopic Studies of Massive Binaries in the Large Magellanic Cloud. I. Introduction and Orbits for Two Detached Systems: Evidence for a Mass Discrepancy?
• Four ultra-short period eclipsing M-dwarf binaries in the WFCAM Transit Survey
• Eclipsing binary stars in the Large and Small Magellanic Clouds from the MACHO project: The Sample
• Magnetic braking saturates: evidence from the orbital period distribution of low-mass detached eclipsing binaries from ZTF
• Towards an Accurate Determination of Parameters for Very Massive Stars: the Eclipsing Binary LMC-SC1-105
• On Neural Architectures for Astronomical Time-series Classification with Application to Variable Stars
• Temperature and Distance Dependence of Tidal Circularization in Close Binaries: A Catalog of Eclipsing Binaries in the Southern Hemisphere Observed by the TESS Satellite
• The Distance to the Massive Eclipsing Binary LMC-SC1-105 in the Large Magellanic Cloud
• Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys
• The University of New South Wales Extrasolar Planet Search: a catalogue of variable stars from fields observed 2004--2007
• LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX
• Properties of M31. V: 298 Eclipsing Binaries from PAndromeda
• Zwicky Transient Facility and Globular Clusters: the Period-Luminosity and Period-Luminosity-Color Relations for Late-Type Contact Binaries
• Double-Mode Radial Pulsations among RR Lyrae Stars
• A search for eclipsing binaries that host discs
• New variable stars in the Galactic Bulge: I. The bright regime
• Non-radially pulsating stars as microlensing sources
• New variable sources revealed by DECam toward the LMC: the first 15 deg2
• The first analysis of extragalactic binary-orbit precession
• Techniques for Observing Binaries in Other Galaxies