Fig. 5

Evolutionary tracks of BHXB with an initial orbital period of 0.84 d, which consists of a donor star of Md = 1.5 M⊙ and a black hole of Mbh = 6.0 M⊙. The solid and dashed curves represent the evolution of the mass transfer rate and BH mass in the top panel, and the donor star mass and donor star radius in the bottom panel, respectively.
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