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Fig. 6.

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Evolutionary route leading to the formation of the 38.9 M + 1.3 M (q = 0.033) BH-NS merger for metallicity Z = 0.0001 (model M280). The evolution from ZAMS to the formation of the BH-NS system takes ∼30.4 Myr, and then it takes ∼2.29 Gyr for the system to in-spiral (angular momentum loss due to the emission of gravitational waves), leading to the final merger of the two compact objects. (CHeB: core helium burning star, He star: naked helium star, HG: Hertzsprung gap star). No tidal spin-up is expected due to large orbital separations when binary components are naked helium stars: a ∼ 25 R (Porb = 2.1d; star A) and a ∼ 200 R (Porb = 60d; star B; see Sect. 2.1).

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