AAS 207th Meeting, 8-12 January 2006
Session 104 Binary and Variable Stars
Oral, Tuesday, 2:00-3:30pm, January 10, 2006, Balcony B

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[104.07] The First DIRECT Distance to a Detached Eclipsing Binary in M33

A.Z. Bonanos (DTM), K.Z. Stanek (Ohio State University), R.P. Kudritzki (IfA), L. Macri (NOAO), D.D. Sasselov (Harvard-Smithsonian CfA), J. Kaluzny (Copernicus Astronomical Center), D. Bersier (STScI), F. Bresolin (IfA), T. Matheson (NOAO), B.J. Mochejska (Purdue University), N. Przybilla (University of Erlangen-Nuremberg), A.H. Szentgyorgyi (Harvard-Smithsonian CfA), J. Tonry (IfA), G. Torres (Harvard-Smithsonian CfA)

We present the first direct distance determination to a detached eclipsing binary in M33, which was found by the DIRECT Project. Located in the OB 66 association, it was one of the most suitable detached eclipsing binaries found by DIRECT for distance determination, given its 4.8938 day period. We obtained follow-up BV photometry and spectroscopy from which we determined the parameters of the system. It contains two O7 main sequence stars with masses of 33.4±.5 Mo and 30.0±.3 Mo and radii of 12.3±.4 Ro and 8.8±.3 Ro, respectively. We derive temperatures of 37000±500 K and 36000±500 K and determine the distance modulus.

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