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astro-ph2000
Detectability of the Parallax-induced Deviations in the Astrometric Centroid Shift Trajectories of Gravitational Microlensing Events
Cheongho Han, Kyongae Chang
The uncertainty of the lens mass can be substantially reduced if it is determined from the lens proper motion obtained from astrometric measurements of the source image centroid sh…
astro-ph2000
Additional Information from Astrometric Gravitational Microlensing Observations
Cheongho Han
Astrometric observations of microlensing events were originally proposed to determine the lens proper motion with which the physical parameters of lenses can be better constrained.…
astro-ph2000
Better Astrometric Deblending of Gravitional Microlensing Events by Using the Difference Image Analysis Method
Cheongho Han
Due to the choice of very dense star fields for a higher event rate, the current microlensing searches suffer from large uncertainties caused by blending effect. To measure light v…