Chromaticity of gravitational microlensing events

被引：14

作者：

Han, C ^{[1
]}

Park, SH ^{[1
]}

Jeong, JH ^{[1
]}

机构：

[1] Chungbuk Natl Univ, Dept Astron & Space Sci, Chongju 361763, South Korea

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2000年 / 316卷 / 01期

关键词：

stars : fundamental parameters; gravitational lensing;

D O I：

10.1046/j.1365-8711.2000.03485.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：97 / 102

页数：6

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