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. MurakiS. 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

Research output: Contribution to journalArticlepeer-review


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 μas. These are the first limb darkening measurements obtained by microlensing for a Solar-like star.

Original languageEnglish
Pages (from-to)L493-L496
JournalAstronomy and Astrophysics
Issue number3
StatePublished - Dec 2003


  • Stars: individual: MOA 2002-BLG-33
  • Stars: limb darkening
  • Techniques: gravitational microlensing
  • Techniques: high angular resolution


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