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Fig. 11

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Radii in UCXB accretion disk versus orbital period for a 1.4   M neutron star accretor with a residual equatorial magnetic field of 108.5 G. The shaded layer at the bottom represents the neutron star surface, at a radius of 12 km. The curve annotated L1 shows the distance of the first Lagrangian point to the neutron star, which is an upper limit on the outer disk radius. The circularization radius by Verbunt & Rappaport (1988) is discussed in Sect. 4.1. The two upper dashed curves indicate the radii where the temperature of a helium disk (Dunkel et al. 2006) equals the He I ionization temperature, for two values of the viscosity parameter α, as discussed in Sect. 2.6.4. The solid corotation radius curve applies to the full propeller case, the dashed one to the hypothetical full accretion case. The speed-of-light cylinder radius and Alfvén radius are also shown.

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