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24 April 2024

» arxiv » astro-ph/0310410

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Probing the atmosphere of a solar-like star by galactic microlensing at high magnification
F. Abe ; D.P. Bennett ; I.A. Bond ; J.J. Calitz ; A. Claret ; K.H. Cook ; Y. Furuta ; A. Gal-Yam ; J-F. Glicenstein ; J.B. Hearnshaw ; P.H. Hauschildt ; D. Kent ; P.M. Kilmartin ; Y. Kurata ; K. Masuda ; D. Maoz ; Y. Matsubara ; P.J. Meintjes ; M. Moniez ; Y. Muraki ; S. Noda ; E.O. Ofek ; K. Okajima ; L. Philpott ; N.J. Rattenbury ; S.H. Rhie ; T. Sako ; D.J. Sullivan ; T. Sumi ; D.M. Terndrup ; P.J. Tristram ; T. Yanagisawa ; P.C.M. Yock ;
Date:	15 Oct 2003
Journal:	Astron.Astrophys. 411 (2003) L493-L496
Subject:	astro-ph
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 micro-arcsec. These are the first limb darkening measurements obtained by microlensing for a Solar-like star.
Source:	arXiv, astro-ph/0310410
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