Probing the atmosphere of a solar-like star by galactic microlensing at high magnification
Open Access
- 17 November 2003
- journal article
- letter
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 411 (3) , L493-L496
- https://doi.org/10.1051/0004-6361:20031602
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 μas. These are the first limb darkening measurements obtained by microlensing for a Solar-like star.Keywords
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