Mass-radius relation exponent ζL (Sect. 3.2) for various modes of mass transfer from a zero-temperature helium white dwarf to a neutron star of initially 1.4 M⊙ with a 12 km radius. The lower dotted curve shows the case of accretion efficiency ϵ = 0 and full feedback (η = 0) (almost all transferred matter lost via isotropic re-emission, hardly any accretion). The middle dotted curve is for ϵ = 1 and η = 0 (conservative mass transfer). The upper dotted curve is for no feedback (η = 1). The zero-temperature white dwarf exponent ζd (Sect. 3.3) is represented by the dashed curve. The solid curves starting at q = 0.59 (Md = 0.83 M⊙, Sect. 2.3) indicate the actual value of ζL (for ϵ shown in Fig. 4) for both the full feedback and no-feedback case. Until q = 0.01 there is full feedback in either case. Below q = 0.01 the full feedback case is shown by the lower solid branch, where the open circle denotes an age of 10 Gyr (since the onset of mass transfer). The no-feedback case has a jump in ζL at q = 0.01, after which it follows the upper dotted curve until the intersection with the dashed curve (filled circle) where donor disruption occurs at a system age of 300 Myr.
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