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Astrometric Properties of Gravitational Binary-Microlens Events and Their Applications

Cheongho Han·Mun-Suk Chun·Kyongae Chang
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Abstract

In this paper, we study the astrometric properties of gravitational microlensing events caused by binary lenses. By investigating the centroid shifts for various types of binary-lens events, we find that the deviations of the centroid shift trajectories from the elliptical ones of single-lens events are characterized by distortions, twistings, and big jumps. We study the conditions of binary-lens system configurations and source star trajectories for individual types of deviations. We find dramatic differences in the astrometric centroid shifts for binary-lens microlensing events that would be degenerate had their parameters been determined photometrically. Therefore, when additional astrometric observations of a binary-lens event are available, one can resolve the ambiguity of the binary-lens fit, and uniquely determine the binary-lens parameters.

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Cheongho Han, Mun-Suk Chun, Kyongae Chang. 1999-06-14. Astrometric Properties of Gravitational Binary-Microlens Events and Their Applications. https://doi.org/10.1086/307996

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