@article{JiangDePoyGalYametal.2004,
  author    = {Jiang, G. F. and DePoy, D. L. and Gal-Yam, A. and Gaudi, B. S. and Gould, A. and Han, C. and Lipkin, Y. and Maoz, D. and Ofek, E. O. and Park, B. G. and Pogge, R. W. and Udalski, A. and Kubiak, Marcin and Szymanski, M. K. and Szewczyk, O. and Zerbrun, K. and Wyrzykowski, L. and Soszynski, I. and Pietrzynski, G. and Albrow, Michael D. and Beaulieu, Jean-Philippe and Caldwell, John A. R. and Cassan, A. and Coutures, C. and Dominik, M. and Donatowicz, J. and Fouque, P. and Greenhill, John and Hill, K. and Horne, Keith and Jorgensen, S. F. and Jorgensen, Uffe Grae and Kane, Stephen R. and Kubas, Daniel and Martin, Ralph and Menzies, J. W. and Pollard, R. and Sahu, K. C. and Wambsganss, Joachim and Watson, R. and Williams, A.},
  title     = {OGLE-2003-BLG-238 : Microlensing mass estimate of an isolated star},
  issn      = {0004-637X},
  year      = {2004},
  abstract  = {Microlensing is the only known direct method to measure the masses of stars that lack visible companions. In terms of microlensing observables, the mass is given by M (c(2)/4G)(r) over tilde (E)theta(E) and so requires the measurement of both the angular Einstein radius theta(E) and the projected Einstein radius (r) over tilde (E). Simultaneous measurement of these two parameters is extremely rare. Here we analyze OGLE-2003-BLG-238, a spectacularly bright (I-min 10.3), high-magnification (A(max) 170) microlensing event. Pronounced finite-source effects permit a measurement of theta(E) = 650 muas. Although the timescale of the event is only t(E) 38 days, one can still obtain weak constraints on the microlens parallax: 4.4 AU < <(r)over tilde>(E) < 18 AU at the 1 \&sigma; level. Together these two parameter measurements yield a range for the lens mass of 0.36 M-\&ODOT; < M < 1.48 M-\&ODOT;. As was the case for MACHO- LMC-5, the only other single star (apart from the Sun) whose mass has been determined from its gravitational effects, this estimate is rather crude. It does, however, demonstrate the viability of the technique. We also discuss future prospects for single-lens mass measurements},
  language  = {en}
}