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Modelling the spin equilibrium of neutron stars in low-mass X-ray binaries without gravitational radiation

Modelling the spin equilibrium of neutron stars in low-mass X-ray binaries without gravitational radiation
Modelling the spin equilibrium of neutron stars in low-mass X-ray binaries without gravitational radiation
In this paper we discuss the spin equilibrium of accreting neutron stars in low-mass X-ray binaries (LMXBs). We demonstrate that, when combined with a naive spin-up torque, the observed data lead to inferred magnetic fields which are at variance with those of Galactic millisecond radio pulsars. This indicates the need for either additional spin-down torques (e.g. gravitational radiation) or an improved accretion model. We show that a simple consistent accretion model can be arrived at by accounting for radiation pressure in rapidly accreting systems (above a few per cent of the Eddington accretion rate). In our model the inner disc region is thick and significantly sub-Keplerian and the estimated equilibrium periods are such that the LMXB neutron stars have properties that accord well with the Galactic millisecond radio pulsar sample. The implications for future gravitational-wave observations are also discussed briefly.
0035-8711
1153-1164
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Glampedakis, K.
bece2036-f721-468e-9cd2-cf4324ff2deb
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Watts, A.L.
b3a12e46-8c85-4eba-b205-81ef9ba1a358
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Glampedakis, K.
bece2036-f721-468e-9cd2-cf4324ff2deb
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Watts, A.L.
b3a12e46-8c85-4eba-b205-81ef9ba1a358

Andersson, N., Glampedakis, K., Haskell, B. and Watts, A.L. (2005) Modelling the spin equilibrium of neutron stars in low-mass X-ray binaries without gravitational radiation. Monthly Notices of the Royal Astronomical Society, 361 (4), 1153-1164. (doi:10.1111/j.1365-2966.2005.09167.x).

Record type: Article

Abstract

In this paper we discuss the spin equilibrium of accreting neutron stars in low-mass X-ray binaries (LMXBs). We demonstrate that, when combined with a naive spin-up torque, the observed data lead to inferred magnetic fields which are at variance with those of Galactic millisecond radio pulsars. This indicates the need for either additional spin-down torques (e.g. gravitational radiation) or an improved accretion model. We show that a simple consistent accretion model can be arrived at by accounting for radiation pressure in rapidly accreting systems (above a few per cent of the Eddington accretion rate). In our model the inner disc region is thick and significantly sub-Keplerian and the estimated equilibrium periods are such that the LMXB neutron stars have properties that accord well with the Galactic millisecond radio pulsar sample. The implications for future gravitational-wave observations are also discussed briefly.

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Published date: 2005

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Local EPrints ID: 29463
URI: https://eprints.soton.ac.uk/id/eprint/29463
ISSN: 0035-8711
PURE UUID: 52859fe0-1b74-47a6-8b48-1332c42475fb

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Date deposited: 11 May 2006
Last modified: 17 Jul 2017 15:57

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