Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-28
Mon.Not.Roy.Astron.Soc. 361 (2005) 1153-1164
Astronomy and Astrophysics
Astrophysics
13 pages, 6 figures, MNRAS style
Scientific paper
10.1111/j.1365-2966.2005.09167.x
In this paper we discuss the spin-equilibrium of accreting neutron stars in LMXBs. We demonstrate that, when combined with a naive spin-up torque, the observed data leads to inferred magnetic fields which are at variance with those of galactic millisecond radiopulsars. This indicates the need for either additional spin-down torques (eg. 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 percent of the Eddington accretion rate). In our model the inner disk 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 radiopulsar sample. The implications for future gravitational-wave observations are also discussed briefly.
Andersson Nils.
Glampedakis Kostas
Haskell Brynmor
Watts Anna L.
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