On the duration of the subsonic propeller state of neutron stars in wind-fed mass-exchange close binary systems

Details On the duration of the subsonic propeller state of neutron stars in wind-fed mass-exchange close binary systems On the duration of the subsonic propeller state of neutron stars in wind-fed mass-exchange close binary systems

2001-11-27

arxiv.org/abs/astro-ph/0111505v1

2001 A&A 368L, 5I

Astronomy and Astrophysics

Astrophysics

3 pages, published in A&A 368, L5

Scientific paper

10.1051/0004-6361:20010140

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_{\rm br} = 450 \mu_{30}^{16/21} \dot{M}_{15}^{-5/7} (M/M_{\sun})^{-4/21} s. This result forced us to reconsider some basic conclusions on the efficiency of the propeller spindown mechanism.

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