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CCD Photometry of QSO 0957+561 A & B for the period 1987–1992 using La Palma archive

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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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Authors and Affiliations

  1. Institute of Astronomy, 72 Tsarigradsko Chausse Blvd., Sofia, 1784, Bulgaria

    L.S. Slavcheva-Mihova & B.M. Mihov

  2. Sternberg Astronomical Institute, Universitetskij Prospect 13, 119899, Moscow, Russia

    V.L. Oknyanskij

Authors
  1. L.S. Slavcheva-Mihova
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  2. V.L. Oknyanskij
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  3. B.M. Mihov
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Slavcheva-Mihova, L., Oknyanskij, V. & Mihov, B. CCD Photometry of QSO 0957+561 A & B for the period 1987–1992 using La Palma archive. Astrophysics and Space Science 275, 385–389 (2001). https://doi.org/10.1023/A:1002720617355

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