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L.J. King (U.Notre Dame/ CfPA), C. Alcock, R.A. Allsman, D. R. Alves, T.S. Axelrod, A.C. Becker, D.P. Bennett, K. H. Cook, A.J. Drake, K. C. Freeman, K. Griest, M.J. Lehner, S.L. Marshall, D. Minniti, B.A. Peterson, P. Popowski, M.R. Pratt, P.J. Quinn, A.W. Rodgers, C.W. Stubbs, W. Sutherland, A. Tomaney, T. Vandehei, D.L. Welch (), MACHO Collaboration
The MACHO collaboration has been searching for microlensing events toward the Galactic Bulge and the Magellanic Clouds. We have used the WFPC2/HST to obtain high resolution images of a number of fields centred on stars that have undergone microlensing events. Ground based optical images typically have a resolution in excess of one arcsecond, so that the microlensed star may be blended with other stars. On HST images the star is unblended.
We show that microlensed stars can be identified by comparing the HST images with image subtracted ground based images. The unblended intrinsic magnitudes, lensed magnitudes and magnifications of the stars can be determined, providing invaluable constraints on lens models.
The author(s) of this abstract have provided an email address for comments about the abstract: ljk@nd.edu