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Fig. 2

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Evolution in time (since the start of mass transfer at tRLOF = 9.62034 × 107 yr) of the primary’s spin angular velocity in units of the orbital velocity, Ω1/ω (dotted green curve, left axis), for the 5 + 3 M system, initial period Pi = 7 d, using the osculating formalism. Panel a): as the primary evolves off the main sequence up to the onset of mass transfer; panel b): during the self-accretion phase; panel c): during the slow mass transfer phase. Panel b) also shows the fraction of ejected material that falls back onto the primary, αself (solid black curve, left axis), and the ratio of the tidal synchronization timescale to the mass transfer timescale, τsync/τ (dashed blue curve, right axis). Note the change in scales along the x-axis in each panel. The top panels indicate the evolution of q = M1/M2, and the open red square indicates where q = 1.

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