Secondary standard stars for CCD photometry ^*,**

¹ Niels Bohr Institute for Astronomy, Physics, and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
² Departamento de Física, E.U.I.T. Industriales, UPM, Ronda de Valencia 3, E-28012 Madrid, Spain
³ Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, Apdo. 50727, E-28080 Madrid, Spain
⁴ European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago, Chile

Corresponding author: Send offprint request to: J.V. Clausen, e-mail: jvc@astro.ku.dk

Received: 2 July 1996
Accepted: 9 August 1996

Abstract

Accurate standard uvby indices are presented for 73 southern B, A, F and G stars in the V magnitude range 8.2 to 10.9. They cover all three transformation regions of the uvby system (Olsen 1983) well. Standard β indices are included for the 55 B, A, and F stars in the sample. Our results provide a useful set of secondary standards for CCD photometry with southern hemisphere 1-2 m class telescopes. A critical comparison with published photometry, in general based on fewer observations, is given.