Fig. 1.
Evolutionary tracks for primary stars of masses 12 and 20 M⊙ for BPASS models (dashed line) and MESA models (solid line). The initial orbital period is log(P/days) = 3.0. Blue, green and red indicate the first, second and third BSG stages respectively. The maroon diamond indicates the evolutionary point at which the hydrogen surface abundance drops below 0.5.
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