The First DIRECT Distance to a Detached Eclipsing Binary in M33 |
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Authors: | A Z Bonanos K Z Stanek R P Kudritzki L Macri D D Sasselov J Kaluzny D Bersier F Bresolin T Matheson B J Mochejska N Przybilla A H Szentgyorgyi J Tonry G Torres |
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Institution: | (1) Harvard-Smithsonian CfA, Cambridge, USA;(2) IfA, Cambridge, USA;(3) NOAO, Cambridge, USA;(4) Copernicus Astronomical Center, Cambridge, USA;(5) STScI, Cambridge, USA;(6) Purdue University, West Lafayette, USA;(7) University of Erlangen-Nuremberg, Erlangen-Nuremberg, USA |
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Abstract: | 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 and and radii of and , respectively. We derive temperatures of K and K and determine the reddening . Using HST photometry for flux calibration in the V band, we obtain a preliminary distance modulus of mag ( kpc). The photometry and thus distance is subject to revision in the final paper. |
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