Contact binary stars of the W UMa type as distance tracers
Slavek M. Rucinski
Abstract
Contact binaries can be used for distance determinations of stellar systems. They are easy to discover and identify and are very abundant among solar-type stars, particularly for MV > +3. The period - luminosity - colour (PLC) relations have similar properties to those for pulsating stars and can currently predict individual values of MV to about +/-0.25 mag.
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