Date: 29.04.2025

Maksymilian Głowacki (OAUW,PL)

The largest catalog of binaries in the Magellanic Clouds from the OGLE project

Abstract:
I will present the most extensive collection to date of eclipsing and ellipsoidal binary systems in the Large and Small Magellanic Clouds, based on observations from the Optical Gravitational Lensing Experiment (OGLE) survey. This new catalog comprises over 75,000 systems and represents the largest sample of its kind assembled so far. I will outline the methods employed to identify and classify these systems within the OGLE-IV dataset and discuss several particularly intriguing types of binaries, including transient eclipsing binaries, where eclipses appear or vanish over time; double periodic variables, exhibiting two distinct cycles of variability; systems with evolving orbital periods; eclipsing binaries hosting pulsating stars; and double eclipsing systems — two eclipsing binaries gravitationally bound to each other. I will compare the properties of Magellanic Cloud binaries with those found in other environments, particularly the Galactic bulge. I will also discuss how our catalog complements and extends existing collections of variable stars from surveys and databases such as Gaia, ASAS-SN, EROS-2, and the International Variable Star Index (VSX).