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Eclipsing binary stars are gratifying objects because of their uniquegeometrical properties upon which all important physical parameters such asmasses, radii, temperatures, luminosities and distance may be obtained inabsolute scale. This poses strict demand on the model to be free of systematiceffects that would influence the results later used for calibrations, catalogsand evolution theory. We present an objective scheme of obtaining individualtemperatures of both binary system components by means of color-indexconstraining, with the only requirement that the observational data-set isacquired in a standard photometric system. We show that for a modest case oftwo similar main-sequence components the erroneous approach of assuming thetemperature of the primary star from the color index yields temperatures whichare systematically wrong by ~100K.Comment: 6 pages, 3 figures, 1 table; to appear in proceedings of the Close  Binaries in the 21st Century conference in Syros, Greec

Disentangling Effective Temperatures of Individual Eclipsing Binary Components by Means of Color-Index Constraining