Journal
ASTRONOMY & ASTROPHYSICS
Volume 411, Issue 3, Pages L493-L496Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20031602
Keywords
techniques : high angular resolution; techniques : gravitational microlensing; stars : limb darkening; stars : individual : MOA-2002-BLG-33
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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 similar to4% in two passbands. The effective angular resolution of the measurements is <1 μas. These are the first limb darkening measurements obtained by microlensing for a Solar-like star.
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