First apsidal motion and light curve analysis of 162 eccentric eclipsing binaries from LMC

Abstract

We present an extensive study of 162 early-type binary systems located in the LMC galaxy that show apsidal motion and have never been studied before. For the ample systems, we performed light curve and apsidal motion modelling for the first time. These systems have a median orbital period of 2.2 days and typical periods of the apsidal motion were derived to be of the order of decades. We identified two record-breaking systems. The first, OGLE LMC-ECL-22613, shows the shortest known apsidal motion period among systems with main sequence components (6.6 years); it contains a third component with an orbital period of 23 years. The second, OGLE LMC-ECL-17226, is an eccentric system with the shortest known orbital period (0.9879 days) and with quite fast apsidal motion period (11 years). Among the studied systems, 36 new triple-star candidates were identified based on the additional period variations. This represents more than 20% of all studied systems, which is in agreement with the statistics of multiples in our Galaxy. However, the fraction should only be considered as a lower limit of these early-type stars in the LMC because of our method of detection, data coverage, and limited precision of individual times of eclipses.

24 pages, 18 figures, 5 tables, published in 2020A&A...640A..33Z

References in corpus (20)

• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Accurate masses and radii of normal stars: modern results and applications
• Stellar Multiplicity
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• The MACHO Project LMC Microlensing Results from the First Two Years and the Nature of the Galactic Dark Halo
• The Magellanic Clouds Photometric Survey: The Small Magellanic Cloud Stellar Catalog and Extinction Map
• A UBVR CCD Survey of the Magellanic Clouds
• A Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35
• Triple-Star Candidates Among the Kepler Binaries
• An Updated Look at Binary Characteristics of Massive Stars in the Cygnus OB2 Association
• Eclipse Timing Variation Analyses of Eccentric Binaries with Close Tertiaries in the Kepler field
• Tidal dissipation in binary systems
• The distance to the Andromeda Galaxy from eclipsing binaries
• Apsidal motion and light a curve solution for eighteen SMC eccentric eclipsing binaries
• Apsidal motions of 90 eccentric binary systems in the Small Magellanic Cloud
• On Formation of Singularity of Spherically Symmetric Nonbarotropic Flows
• Apsidal motion and absolute parameters for five LMC eccentric eclipsing binaries
• Apsidal Motion and Absolute Parameters of 21 Early-type Small Magellanic Cloud Eccentric Eclipsing Binaries
• Apsidal motion and a light curve solution for thirteen LMC eccentric eclipsing binaries
• V456 Ophiuchi and V490 Cygni: Systems with the shortest apsidal-motion periods

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• Tidally excited oscillations in MACHO 80.7443.1718: Changing amplitudes and frequencies, high-frequency tidally excited mode, and a decrease in the orbital period