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Photometric observations in Sloan g' and i' bands of four W UMa stars, NSVS2244206, NSVS 908513, CSS J004004.7+385531, VSX J062624.4+570907, arepresented. The light curve solutions reveal that all targets have overcontactconfigurations with fillout factor within 0.15-0.26. Their components are ofG-K spectral type and almost in thermal contacts. They are relatively closealso in size and luminosity: the radius rations r_2/r_1 are within 0.75-0.90;the luminosity ratios l_2/l_1 are within 0.53-0.63. The results of the lightcurve solution of CSS J004007.7+385531 imply weak limb-darkening effect of itsprimary component and possible presence of additional absorbing feature in thesystem.

Photometric observations and light curve solutions of the W UMa stars NSVS 2244206, NSVS 908513, CSS J004004.7+385531 and VSX J062624.4+570907