Observations and light curve solutions of six deep-contact W UMa binaries
Abstract
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.
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- October 2017
- Bibcode:
- 2017RMxAA..53..235K
- Keywords:
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- binaries: eclipsing;
- binaries: close;
- stars: fundamental parameters