Journal
ASTRONOMY & ASTROPHYSICS
Volume 458, Issue 3, Pages 881-884Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20065664
Keywords
stars : neutron; stars : pulsars : general; dense matter; stars : rotation
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Aims. To determine whether vortex creep in neutron stars, the slow motion of neutron vortices with respect to pinning sites in the core or inner crust, is consistent with observations of long-period precession. Methods. Using the concept of vortex drag, I discuss the precession dynamics of a star with imperfectly-pinned (i.e.,creeping) vortices. Results. The precession frequency is far too high to be consistent with observations, indicating that the standard picture of the outer core (superfluid neutrons in co-existence with type II, superconducting protons) should be reconsidered. There is a slow precession mode, but it is highly over-damped and cannot complete even a single cycle. Moreover, the vortices of the inner crust must be able to move with little dissipation with respect to the solid.
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