Evolutionary track of the DPV V4142 Sgr with a secondary star (black line) of initial mass M_i, d = 3.50 M_⊙ and its companion (red line) of M_i, g = 1.50 M_⊙. The dashed blue line represents the evolutionary track of a single star, identical to the initial mass of the gainer star, using the same initial parameters that were used to model the gainer, until central helium depletion (X_Hec < 0.2). The green line represents the evolutionary track for a single star, using the same donor initial parameters. The most important points during the evolution are labeled together with the initial and final theoretical masses. The blue zone represents the threshold of rejuvenated B-type stars. The uppercase black letters mark each stage of the donor star, while the lowercase red letters represent the stages of the gainer star (see Table 1).