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Up: UBV absolute CCD

1. Introduction

Until recently and due to technical difficulties (Rakos 1982) only few photometric measurements of close visual binaries have been published. For these reasons, our knowledge on this stellar system is still insufficient.

Under the visual binaries those systems with solar type components are especially interesting for understanding the evolution of the Sun. The present work is the first attempt to study them systematically: this is the first paper in which we present absolute photometry of close visual double stars with G - type primaries. The sample has been chosen in such a way that the secondaries are usually G - type stars as well.

Copyright by the European Southern Observatory (ESO)