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19 April 2024

» arxiv » astro-ph/0506013

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Determination of stellar shape in microlensing event MOA 2002-BLG-33
N. J. Rattenbury ; 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 ; 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 ; S. H. Rhie ; T. Sako ; D. J. Sullivan ; T. Sumi ; D. M. Terndrup ; P. J. Tristram ; J. Wood ; T. Yanagisawa ; P. C. M. Yock ;
Date:	1 Jun 2005
Subject:	astro-ph
Abstract:	We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b = 1.02^{+0.04}_{-0.02} where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04 microarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.
Source:	arXiv, astro-ph/0506013
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