2000/01/31 by Cheongho Han, C. Han, S.-H. Park +1 · 8 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Binary number #Gravitational lens #Gravitational microlensing #Image (mathematics) #Lens (geology) #Light curve #Point source #Pulsars and Gravitational Waves Research #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2001.03926.x
published in Monthly Notices of the Royal Astronomical Society 320(1), 41-48 (Oxford University Press) · total 8 pages, including 4 figures and no table, MNRAS, in press
arxiv created 2000/08/07 · openalex publication_date 2001/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Detecting colour changes of a gravitational microlensing event induced by the limb-darkened extended source effect is important for obtaining useful information about both the lens and the source star. However, precise measurements of the colour changes are hampered by blending, which also causes colour changes of the event. In this paper, we show that although the colour change measured from the subtracted image by using the recently developed photometric method of the ‘difference image analysis’ (DIA) differs from the colour change measured by using the conventional method based on the extraction of the individual source stars’ point spread functions, the curve of the colour changes (colour curve) constructed by using the DIA method enables one to obtain the same information about the lens and source star, but with significantly reduced uncertainties due to the absence of blending. We investigate the patterns of the DIA colour curves for both single lens and binary lens events by constructing colour change maps.