Abstract
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 0.2m 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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Original Russian Text © E.A. Koptelova, B.P. Artamonov, V.V. Bruevich, O.A. Burkhonov, A.V. Sergeev, 2008, published in Astronomicheskiĭ Zhurnal, 2008, Vol. 85, No. 4, pp. 305–313.
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Koptelova, E.A., Artamonov, B.P., Bruevich, V.V. et al. Variability of the gravitational lens UM 673 in 2003–2005. Astron. Rep. 52, 270–277 (2008). https://doi.org/10.1134/S1063772908040021
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DOI: https://doi.org/10.1134/S1063772908040021