Standard uvby indices have been obtained for 73 southern
B, A, F and G stars in the V magnitude range 8.2 to 10.9. Standard
indices have been obtained for the 55 B, A and F stars in the sample.
The results presented in Table 5 (click here) are based on many
individual measurements per star (3-28, typically 8) and firmly tied to
the standard
system through observation of 40-50 primary standards per night.
As a wide range of the HR diagram is covered the stars provide a useful
set of secondary standards for 
CCD photometry with
southern 1-2 m class telescopes. They are presently used in a project
on eclipsing binaries and population studies in the Magellanic Clouds.
As described in Sect. 5 small systematic differences between our indices and those published in various lists are noticed. They may be due to slight zero-point shifts introduced by the different subsets of primary standards used, but in general the reason is not clear. In all cases observations, reduction and transformation seem to have been done carefully.
The situation illustrates the need for a large-scale project
providing accurate 
photometry for stars within
a grid of typical CCD size fields (e.g. along the celestial
equator) based on intensive observations through several
years.
Acknowledgements
We would like to thank H. Jønch-Sørensen and E.H. Olsen for their advise and for many fruitful comments throughout this project. Assistance from the ESO staff at La Silla during the observations is gratefully acknowledged. The project was supported by grants from The Danish Natural Science Research Council and the Danish Board for Astronomical Research, and by ESO through a 2-months Studentship to SSL in 1995. This investigation has made use of the Simbad database operated at CDS, Strasbourg, France.