Author/Authors :
Cook، K. H. نويسنده , , Hauschildt، P. H. نويسنده , , Claret، A. نويسنده , , Abe، F. نويسنده , , Bennett، D. P. نويسنده , , Bond، I. A. نويسنده , , Calitz، J. J. نويسنده , , Furuta، Y. نويسنده , , Gal-Yam، A. نويسنده , , J.-F. Glicenstein، نويسنده , , Hearnshaw، J. B. نويسنده ,
Abstract :
We report a measurement of limb darkening of a solar-like star in the very high magnification microlensing event MOA 2002-BLG-33. A 15 hour deviation from the light curve profile expected for a single lens was monitored intensively in V and I passbands by five telescopes spanning the globe. Our modelling of the light curve showed the lens to be a close binary system whose centre-of-mass passed almost directly in front of the source star. The source star was identified as an F8-G2 main sequence turn-off star. The measured stellar profiles agree with current stellar atmosphere theory to within ~4% in two passbands. The effective angular resolution of the measurements is <1 (mu) as. These are the first limb darkening measurements obtained by microlensing for a Solar-like star.
Keywords :
stars: individual: MOA 2002-BLG-33 , stars: limb darkening , techniques: high angular resolution , techniques: gravitational microlensing
