Variability of the gravitational lens UM 673 in 2003-2005

E. A. Koptelova, B. P. Artamonov, V. V. Bruevich, O. A. Burkhonov, A. V. Sergeev

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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.

Original languageEnglish
Pages (from-to)270-277
Number of pages8
JournalAstronomy Reports
Issue number4
StatePublished - Apr 2008


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