Variability of the gravitational lens UM 673 in 2003–2005
E. KoptelovaMoscow State UniversityБ. П. АртамоновSternberg Astronomical Institute, Moscow State University, Universitetskii prospekt 13, Moscow, 119992, RussiaВ. В. БруевичSternberg Astronomical Institute, Moscow State University, Universitetskii prospekt 13, Moscow, 119992, RussiaО. БурхоновUlugh Beg Astronomical Institute, Uzbek Academy of Sciences, Astronomicheskaya ul. 33, Tashkent, 700052, UzbekistanA. SergeevKharkov National University
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Annotatsiya
Results of VRI photometry of two components of the gravitationally lensed quasar UM 673 in 2003–2005 are presented. The observational data were obtained on the 1.5-m telescope of the Maidanak observatory. During the monitoring of the system, considerable brightness variations in components A and B with amplitudes of about 0.2 m were recorded, demonstrating variability of the quasar. The increase in the brightness of the components was accompanied by reddening of their V-R color indices. Analysis of the brightness and color variations of the components shows no variations related to microlensing.
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