Abstract

Abstract A new approach to the estimation of component mass ratios for close binary systems is suggested. 225 magnitudes of mass ratios for W UMa-type contact binaries, unobserved by spectroscopic methods, are restored by the ZET statistical method. 204 magnitudes of the spectral classes of the main components for this type of system are defined in an analogous way. The evolutionary types of some stars are specified as a matter of record. The efficiency of the ZET method for predicting these characteristics of W UMa-type contact systems is shown.

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