Abstract

KJURKCHIEVA, Diana P.; POPOV, Velimir A.; VASILEVA, Doroteya L.  and  PETROV, Nikola I.. Observations and Light Curve Solutions of Six Deep-Contact W UMA Binaries. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.2, 00007.  Epub Oct 21, 2019. ISSN 0185-1101.

This work presents photometric observations of the W UMa binaries V0637 Peg. V0473 Cam, CSS J153314.8+560527, CSS J075258.0+382035, V0416 Gem and NSVS 6859986, made using Sloan g ′ and i ′ filters. The periods of these binaries are in the range of 0.26-0.43 d. The light curve solutions revealed that the components of each binary system are almost equal in temperature. The stellar components are of G and K spectral types and undergo total eclipses. All observation targets have deep-contact configurations with a fill-out factor of f ≥ 0.5. NSVS 6859986 has one of the highest fill-out factors that have been determined, f = 0.84. We studied the empirical dependencies between the fill-out factor and the stellar parameters (temperature, period, mass ratio, relative component radii, and luminosity ratio) in a sample of around thirty stars; they are consistent with theoretical predictions, although there are deviations from the main tendencies.

Keywords : binaries: eclipsing; binaries: close; stars; fundamental parameters.

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