CCD Photometry of QSO 0957+561 A & B for the period 1987–1992 using La Palma archive |
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| Authors: | LS Slavcheva-Mihova VL Oknyanskij BM Mihov |
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| Institution: | (1) Institute of Astronomy, 72 Tsarigradsko Chausse Blvd., Sofia, 1784, Bulgaria;(2) Sternberg Astronomical Institute, Universitetskij Prospect 13, 119899 Moscow, Russia |
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| Abstract: | We present the results of CCD photometry of the first gravitational lenssystem QSO 0957+561, obtained on the base of La Palma archive. Usingcross-correlation analysis we have found the time delay between A and Bquasar images to be 430 ± 15 days. Our photometry of QSO 0957+561 A & Bgives additional independent confirmation of the recent results on the time delay about 425 days. |
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