We present the analysis of 11 589 eclipsing binary stars identified in twenty-one OGLE-III Galactic disk fields toward constellations of Carina, Centaurus, and Musca.
The binaries have out-of-eclipse brightness between I=12.5 mag and I=21 mag. The completeness of the catalog is estimated at a level of about 75%.
Comparison of the orbital period distribution for the OGLE-III disk binaries with systems detected in other recent large-scale Galactic surveys shows the maximum around 0.40 d and an almost flat distribution between 0.5 d and 2.5 d, indepedent of population.
Among thousands of variables we have found ten doubly eclipsing objects and one eclipsing-ellipsoidal object, of which nine are candidates for quadruple systems. We also identify ten eclipsing subdwarf-B-type binary stars and numerous eclipsing RS CVn-type variables.
Details on the detected objects, V- and I-band photometry, and finding charts are available to the astronomical community from the OGLE Internet archive.