EDP Sciences
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Volume 402, Number 3, May II 2003
First Science with the ODIN satellite
Page(s) 1157 - 1158
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20030310

A&A 402, 1157-1158 (2003)
DOI: 10.1051/0004-6361:20030310

A catalog of secondary photometric standard stars around gravitational lenses

Th. Nakos1, 2, 3, E. O. Ofek4, P. Boumis5, 6, J. Cuypers1, D. Sinachopoulos5, E. van Dessel1, A. Gal-Yam4, 7 and J. Papamastorakis6, 8

1  Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
2  Université de Liège, Institut d'Astrophysique et de Géophysique, Allée du 6 Ao $\hat{\rm u}$t, 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

(Received 26 December 2002 / 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  $BV(RI)_{\rm c}$ photometric system. For ten gravitational lenses (GLs) we also provide the $BV(RI)_{\rm c}$ 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

Offprint request: Th. Nakos, tnakos@eso.org

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© ESO 2003