On the duration of the subsonic propeller state of neutron stars in wind-fed mass-exchange close binary systems
Abstract
The condition for the subsonic propeller - accretor state transition of neutron stars in wind-fed mass-exchange binary systems is discussed. I show that the value of the break period, at which the neutron star change its state to accretor, presented by Davies & Pringle (1981) is underestimated by a factor of 7.5. The correct value is P br = 450 μ3016/21 M15-5/7 (M/M)-4/21 s. This result forced us to reconsider some basic conclusions on the efficiency of the propeller spindown mechanism.
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