a) Model line profiles of the primary star broadened by rotation and perturbed by tidal interactions in a binary system with sub-synchronous rotation (Ω∗ stellar angular velocity; Ωb circular orbital angular velocity). b) FT of spectral lines shown in a). c) Model line profiles of the primary star broadened by rotation and perturbed by tidal interactions in a binary system with super-synchronous rotation. d) FT of spectral lines shown in c). The red lines are either for the averaged line profiles, which represent the tidally unperturbed rotationally broadened line profile, or for the FT of the averaged line profile.
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