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Photometric Monitoring Of The Lensed QSO 0957+561

  • D. Sinachopoulos (a1), M. Burger (a1), E. van Dessel (a1), M. Geffert (a2), M. Thibor (a2), J. Colin (a3) and Ch. Ducourant (a3)...

Extract

We present our first results of a photometric monitoring project of the twin quasar 0957+561. This project aims mainly at the improvement of the determination of the time delay ΔT(A,B) for this gravitational lens, since the “time delay controversy on QSO 0957+561 (is) not yet decided” (Pelt et al. 1994). In addition, the quite large field of the CCD used allows also a long-term astrometric and photometric study of stars and galaxies in the field within a radius of about 10 arcminutes around the lens.

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References

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Pelt, J., Hoff, W., Kayser, R., Refsdal, S., & Schramm, T., 1994, A&A, 286, 775
Schild, R.E. & Weekes, T., 1984, ApJ, 277, 481
Schild, R.E. & Cholfin, B., 1986, ApJ, 300, 209
Vanderriest, C., et al., 1989, A&A, 215, 1

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