Thursday, June 27, 2013

1306.6324 (P. Pietrukowicz et al.)

Eclipsing Binary Stars in the OGLE-III Galactic Disk Fields    [PDF]

P. Pietrukowicz, P. Mroz, I. Soszynski, A. Udalski, R. Poleski, M. K. Szymanski, M. Kubiak, G. Pietrzynski, L. Wyrzykowski, K. Ulaczyk, S. Kozlowski, J. Skowron
We present the analysis of 11,589 eclipsing binary stars identified in 21 OGLE-III Galactic disk fields toward constellations of Carina, Centaurus, and Musca. All eclipsing binaries but 393 objects are new discoveries. The binaries have out-of-eclipse brightness between I=12.5 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 and 2.5 d, indepedent of population. Among thousands of variables we have found 10 doubly eclipsing objects and one eclipsing-ellipsoidal object, of which 9 are candidates for quadruple systems. We also identify 10 eclipsing subdwarf-B-type binary stars and numerous eclipsing RS Canum-Venaticorum-type variables. All objects reported in this paper are part of the OGLE-III Catalog of Variable Stars.
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