Photometric Variability of the Gravitational Lens 0142-100 (UM 673)
We present the results of a photometric CCD monitoring of the gravitational lens system UM 673 that took place from 1995 to 2000. In total, the doubly imaged quasar (QSO) was observed in the R band during 29 photometric nights, using optical telescopes with dimensions in the range 0.6-1.3 m. We detected a significant variability in the total light
Sinachopoulos, D. et al.
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2001