Fig. 4


Total masses and orbital periods at core helium depletion for systems with qi = 1 at four different metallicities. Dashed lines show constant merger times assuming direct collapse into a black hole, and the shaded region indicates the mass range at which PISNe would occur, resulting in the total disruption of the stars instead of black hole formation. The coloured bands represent the relative number of objects formed for each metallicity.

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