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On the dynamical coupling between the superfluid interior and the crust of a neutron star
Alpar, M. A.; Sauls, J. A.
AA(Scientific and Technical Research Council of Turkey, Research Institute for Basic Sciences, Gebze), AB(Northwestern University, Evanston, IL)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 723-725. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Dense Plasmas, Neutron Stars, Stellar Composition, Stellar Cores, Stellar Interiors, Stellar Rotation, Charged Particles, Computational Astrophysics, Electron Scattering, Moments Of Inertia, Stellar Magnetic Fields
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Some implications of earlier work on the coupling of a neutron star's superfluid core to its crust are clarified. It is shown that the very short time, tauv, for the relaxation of relative velocity between the plasma interior (protons and electrons) and the neutron vortices implies a time scale taud = tauv (rho/rhoc) for the coupling of the neutron star's core superfluid to the crust where rho(rhoc) is the total (charged) fluid density. One consequence of such a short coupling time is that free precession of a neutron star, as is suggested for the 35-day mode of Her X-1, must be continuously excited, as it would otherwise be damped out in 400-10,000 precession periods.

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