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Up: Four colour photometry

4. Conclusions

We have performed a photometric observational program to obtain precise uvby and tex2html_wrap_inline1074 light curves of late-type main-sequence detached binary systems. The accuracy of the photometry, evaluated as the dispersion of the discrepancies in the magnitudes and indices for the standard stars, is estimated at a few millimagnitudes.

In this paper we have presented the first complete tex2html_wrap_inline1076 photometric light curves for ZZ UMa. The comparison stars used showed no variability.

We have presented also uvby and tex2html_wrap_inline1080 photometry for the standard stars observed in the program, and details about the standard transformation procedure.


The 1.5 m telescope at Calar Alto is operated by the Observatorio Astronomico Nacional. The 0.5 m telescope at La Silla is operated by the Copenhagen Group. The 1 m telescope at Sierra Nevada is operated by the Instituto de Astrofísica de Andalucía. We want to express our gratitude to the observatories staff. This work has been supported by the Spanish Comision Interministerial de Ciencia y Tecnologia (PB90-0001-C02).

Copyright by the European Southern Observatory (ESO)