Determination of stellar shape in microlensing event MOA 2002-BLG-33
Rattenbury, N. J. · Abe, F. · Bennett, D. P. · Bond, I. A. · Calitz, J. J. · Claret, A. · Cook, K. H. · Furuta, Y. · Gal-Yam, A. · Glicenstein, J-F. · Hearnshaw, J. B. · Hauschildt, P. H. · Kilmartin, P. M. · Kurata, Y. · Masuda, K. · Maoz, D. · Matsubara, Y. · Meintjes, P. J. · Moniez, M. · Muraki, Y. · Noda, S. · Ofek, E. O. · Okajima, K. · Philpott, L. · Rhie, S. H. · Sako, T. · Sullivan, D. J. · Sumi, T. · Terndrup, D. M. · Tristram, P. J. · Wood, J. · Yanagisawa, T. · Yock, P. C. M.
Original · EN
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.
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