Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
2 Université de Liège, Institut d'Astrophysique et de Géophysique, Allée du 6 Aot, 17, B5C, 4000 Sart Tilman, Liège, Belgium
3 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
4 School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
5 Institute of Astronomy & Astrophysics, National Observatory of Athens, Lophos Kouphou - Palaia Penteli, 15236 Athens, Greece
6 Department of Physics, University of Crete, PO Box 2208, 710 03 Heraklion, Crete, Greece
7 Colton Fellow
8 Foundation for Research and Technology-Hellas, PO Box 1527, 711 10 Heraklion, Crete, Greece
Corresponding author: Th. Nakos, email@example.com
Accepted: 28 February 2003
We present a catalog of secondary photometric standard stars in the neighborhood of 14 gravitationally lensed quasars. These stars were verified to be non variable using long-term monitoring. The instrumental magnitudes of the new standard stars have been transformed to the Johnson-Cousins photometric system. For ten gravitational lenses (GLs) we also provide the mean magnitudes of the integrated flux of all the lens components, for the epochs of the photometric calibration.
Key words: techniques: photometry / gravitational lensing / quasars: general
Based on observations made with a) the 1.0 m telescope at Wise Observatory, Israel, b) the 1.3 m telescope at Skinakas Observatory, Crete, Greece, and c) the 1.9 m SAAO telescope, Sutherland Observatory, South Africa.
© ESO, 2003