Jfl. Simmons et al., VARIABLE POLARIZATION AND LUMINOSITY FOR MICROLENSING OF EXTENDED STELLAR SOURCES, Monthly Notices of the Royal Astronomical Society, 276(1), 1995, pp. 182-190
Microlensing of extended stellar sources in the LMC and Galaxy by low-
mass lenses can produce variable polarization, The characteristics of
the polarization and flux profiles can provide considerable informatio
n about the lens geometry, and help determine the importance of such l
oci-mass objects as a dark matter component.