A&A 376, 745-750 (2001)
DOI: 10.1051/0004-6361:20011001

CCD standards for U and I in the open cluster NGC 7790

G. Petrov¹, W. Seggewiss², A. Dieball² and B. Kovachev<sup>1

1</sup>  Institute of Astronomy, Bulgarian Academy of Sciences, Sofia, Bulgaria
    e-mail: petrov@astro.bas.bg; kovachev@astro.bas.bg
²  Universitätssternwarte Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
    e-mail: seggewis@astro.uni-bonn.de; adieball@astro.uni-bonn.de

(Received 17 November 2000 / Accepted 12 June 2001 )

Abstract
Photometric U and I standard sequences in the field of the open cluster NGC 7790 are presented. The intention is to achieve wide ranges in magnitude and colour, making these sequences suitable for calibrating deep CCD photometry. The 84 standard stars extend the BVR sequences of Odewahn et al. (1992) to the near UV and IR, respectively.

Key words: techniques: photometric -- astronomical data bases: miscellaneous -- open clusters: individual: NGC 7790

Offprint request: W. Seggewiss, seggewis@astro.uni-bonn.de

SIMBAD Objects in preparation
Tables at the CDS

© ESO 2001

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