Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..45..369j&link_type=abstract
Astrophysics and Space Science, vol. 45, Dec. 1976, p. 369-381.
Astronomy and Astrophysics
Astrophysics
18
Dipole Moments, Magnetic Dipoles, Pulsars, Secular Variations, Stellar Magnetic Fields, Electrical Resistivity, Magnetic Variations, Plastic Deformation, Spin Dynamics, Stellar Evolution, Stellar Rotation, Torque
Scientific paper
The time dependences of the inertia tensor and of a dissipative torque caused by the nonleptonic weak interaction have been investigated for a certain class of pulsars with no solid core. Early in the life of the pulsar, the angular-velocity vector is predicted to move with respect to fixed body axes in such a way that it becomes perpendicular to the magnetic dipole moment. During this motion, the solid outer shell suffers plastic deformation so that the dipole moment becomes approximately collinear with a principal axis. After 10,000 or 100,000 yr, the dissipative torque is negligibly small compared with the electromagnetic torque, the Euler equations are those for a simple rigid body, and alignment of spin and dipole moment occurs. If the dipole moment discussed by Lyne et al. (1975) is interpreted as being equal to the component perpendicular to the spin, its secular decay is a natural property of this model and is not a consequence of field decay through electrical resistivity.
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