Relationship between effective temperature (﹩\mathrm{log}{T}_{{\rm{eff}}}﹩) and intrinsic infrared color (J − K)₀ for the binary star sample of M. Vaňko et al. (2026). The primary and secondary components of IR Cas are denoted by green and red diamond symbols, respectively. The dashed line represents the theoretical main-sequence (Luminosity Class V) track, while the dotted line indicates the giant (Luminosity Class III) track.