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7 papers · 1 filter
Chromaticity of Gravitational Microlensing Events
Cheongho Han, Seong-Hong Park, Jang-Hae Jeong
In this paper, we investigate the color changes of gravitational microlensing events caused by the two different mechanisms of differential amplification for a limb-darkened extend…
Distribution of Caustic-Crossing Intervals for Galactic Binary-Lens Microlensing Events
Cheongho Han, Seong-Hong Park, Yong-Sam Lee
Detection of caustic crossings of binary-lens gravitational microlensing events is important because by detecting them one can obtain useful information both about the lens and sou…
On the Baseline Flux Determination of Microlensing Events Detectable with the Difference Image Analysis Method
Cheongho Han
To improve photometric precision by removing blending effect, a newly developed technique of difference image analysis (DIA) is adopted by several gravitational microlensing experi…
Astrometric Properties of Gravitational Binary-Microlens Events and Their Applications
Cheongho Han, Mun-Suk Chun, Kyongae Chang
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-le…
Identification of Bright Lenses from the Astrometric Observations of Gravitational Microlensing Events
Cheongho Han, Youngjin Jeong
When a source star is gravitationally microlensed by a dark lens, the centroid of the source star image is displaced relative to the position of the unlensed source star with an el…
On the Intrinsic Bias in detecting Caustic Crossings between Galactic Halo and Self-lensing Events in the Magellanic Clouds
Cheongho Han
In this paper, we investigate the intrinsic bias in detecting caustic crossings between Galactic halo and self-lensing events in the Magellanic Clouds. For this, we determine the r…