Minimum mass of the in-spiralling object, MX,min which is needed to expel the envelope during a CE evolution with α = 1, for a given donor star radius as indicated by the coloured lines, as a function of ZAMS mass of the donor star, MZAMS for Z = Z⊙/ 50 (upper panel) and Z = ZMW (lower panel). Rmax is the maximum radial extent during the stellar evolution. The grey band between 1.17 and 1.56M⊙ indicates masses of NSs observed in double NS systems (Martinez et al. 2015).
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