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Chromaticity of gravitational microlensing events
Authors:Cheongho Han  Seong-Hong Park  Jang-Hae Jeong
Institution:Department of Astronomy &Space Science, Chungbuk National University, Chongju, Korea 361-763
Abstract:In this paper, we investigate the colour changes of gravitational microlensing events caused by the two different mechanisms of differential amplification for a limb-darkened extended source and blending. From this investigation, we find that the colour changes of limb-darkened extended source events (colour curves) have dramatically different characteristics depending on whether the lens transits the source star or not. We show that for a source transit event, the lens proper motion can be determined by simply measuring the turning time of the colour curve instead of fitting the overall colour or light curves. We also find that even for a very small fraction of blended light, the colour changes induced by blending are equivalent to those induced by limb darkening, causing serious distortion in the observed colour curve. Therefore, to obtain useful information about the lens and source star from the colour curve of an event, it will be essential to correct for blending. We discuss various methods of blending correction .
Keywords:stars: fundamental parameters  gravitational lensing
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