Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
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. … Chalfin, B., 1986, ApJ, 300, 209
Vanderriest C., et al., 1989, A&A, 215, 1
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 International Astronomical Union
About this paper
Cite this paper
Sinachopoulos, D. et al. (1996). Photometric Monitoring of the Lensed QSO 0957+561. In: Kochanek, C.S., Hewitt, J.N. (eds) Astrophysical Applications of Gravitational Lensing. International Astronomical Union / Union Astronomique Internationale, vol 173. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0221-3_13
Download citation
DOI: https://doi.org/10.1007/978-94-009-0221-3_13
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-3955-7
Online ISBN: 978-94-009-0221-3
eBook Packages: Springer Book Archive