Fig. 1.
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Torque reversal of 4U 1626–67 for different ξ values. The model parameters are B = 3 × 1012 G, Δr/rin = 0.2, η = 1, d = 5.3 kpc. We obtained the data from Takagi et al. (2016, and references therein). For both models, the spin-down torque is inactivated when rin = rco − Δr/2 (see the text for details). (a) ξ = 0.68, (b) ξ = 0.80.
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