Query : 2017MNRAS.466..175E

2017MNRAS.466..175E - Mon. Not. R. Astron. Soc., 466, 175-180 (2017/March-3)

The inner disc radius in the propeller phase and accretion-propeller transition of neutron stars.


Abstract (from CDS):

We have investigated the critical conditions required for a steady propeller effect for magnetized neutron stars with optically thick, geometrically thin accretion discs. We have shown through simple analytical calculations that a steady-state propeller mechanism cannot be sustained at an inner disc radius where the viscous and magnetic stresses are balanced. The radius calculated by equating these stresses is usually found to be close to the conventional Alfven radius for spherical accretion, rA. Our results show that: (1) a steady propeller phase can be established with a maximum inner disc radius that is at least ∼15 times smaller than rA depending on the mass-flow rate of the disc, rotational period and strength of the magnetic dipole field of the star, (2) the critical accretion rate corresponding to the accretion-propeller transition is orders of magnitude lower than the rate estimated by equating rA to the co-rotation radius. Our results are consistent with the properties of the transitional millisecond pulsars that show transitions between the accretion powered X-ray pulsar and the rotational powered radio-pulsar states.

Abstract Copyright: © 2016 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - pulsars: individual: PSR J1023+0038 - pulsars: individual: XSS J12270-4859 - pulsars: individual: XSS J12270-4859

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 332 0
2 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 218 0

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