Position of the components of HD 149 404 in the Hertzsprung-Russell diagram (upper panels) and in the log g–log T_eff diagram (lower panels). The filled (resp. empty) symbols correspond to the primary (resp. secondary) star. In the left panels, evolutionary tracks for single massive stars at solar metallicity and initially rotating at 0.4 × v_crit from Ekström et al. (2012) are overplotted. The dashed red lines correspond to isochrones of 5.0 and 7.9 Myr. In the right panels we show evolutionary tracks from Brott et al. (2011). The solid lines yield tracks with initial equatorial rotational velocities near 100 km s⁻¹ (112, 111, 110, 109, and 109 km s⁻¹ for the 15, 20, 25, 30, and 35 M_⊙ models), whilst the dashed tracks correspond to initial equatorial rotational velocities near 200 km s⁻¹ (216, 214, and 213 km s⁻¹ for the 35, 40, and 50 M_⊙ models).