Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..619j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO. 3/AUG1, P. 619, 1993
Astronomy and Astrophysics
Astronomy
15
Dense Matter - Hydrodynamics - Stars: Neutron - Pulsars: General
Scientific paper
The abrupt changes in the angular frequency of rotation seen in several pulsars are followed by relaxation of the angular frequency time-derivative Ωṡ, assumed to be caused by angular momentum transfer to the inner-crust neutron superfluid. Quantitative calculations show that the large changes δΩṡ(t) observed in PSR 0355+54 and 0833-45 are not consistent with the relaxation of superfluid and pinned vortices, unless either the neutron star equation of state or the distribution of superfluid moment of inertia with vortex pinning energy has exceptional properties. However, a component in which the vortices are in almost exact corotation with the superfluid, and not with the solid crust, can have the appropriate relaxation. The moment of inertia and relaxation time in a 1.4-Msun neutron star, with a fairly soft equation of state, can explain the short-time part of δΩṡ(t), and may allow an estimate of the internal temperature.
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