Top: mass-transfer rate and evolution of the donor star mass. Bottom: evolution of the theoretical value of P_cycle/P_orb considering γ = 0.27 ± 0.01 (blue region), together with the estimated dynamo number. The horizontal line shows the observed relation P_long/P_orb = 33.2. In both panels, the vertical line indicates the age, according to the best MESA evolutionary model, at which the system reaches an orbital period of $P_{\mathrm{orb}}=6\stackrel{\text{d}}{.}904858$.