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ABSOLUTE PARAMETERS AND MASS-RADIUS-LUMINOSITY RELATIONS FOR THE SUB-TYPES OF W UMα BINARIES

  • AWADALLA N. S. (National Research Institute of Astronomy and Geophysics (NRIAG)) ;
  • HANNA M. A. (National Research Institute of Astronomy and Geophysics (NRIAG))
  • Published : 2005.06.01

Abstract

The authors have assembled a sample of 80 W UMa binary systems (42 W-subtype and 38 A-subtype) whose light curves have all been solved by means of the recent W-D code and combined with up-to-date radial velocity solutions. The absolute parameters (masses, radii and luminosities) have been derived (without any constraint on the physical parameters). The main results of this paper are: (1) the mass-luminosity relations for both W&A-subtypes. as well as for all W UMa contact binaries have been shown, (2) the mass-radius relations have been found for both subtypes, (3) some remarks on the evolution status have been presented.

Keywords

contact binaries;W UMa type;parameters;catalogue;mass-radius-luminosity relation;angular momentum.

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