Evolution of the models described in Sect. 3.5, with Ṁ = 10^-3M_⊙ yr^-1 and j_accr ≃ 10¹⁸ cm² s^-1, started from the CV and the RC models (black and green lines, respectively). Upper panel: stellar radius, second panel: moment of inertia, third panel: accretion of angular momentum, and the lowest panel the ratio of the surface rotation velocity to the critical velocity. In the upper panel, the solid lines correspond to the stellar radius and the dotted lines indicate the location of the layer that encloses 90% of the actual stellar mass. In the third panel, the grey dotted line is the ideal value of j_accr = 10¹⁸ cm² s^-1 while in the lowest panel, the grey dotted line indicate the critical limit and the coloured dotted lines indicate the evolution of v_surf/v_crit with the assumption of solid-body rotation (see Sect. 5.4).