Free precession of neutron stars - Role of possible vortex pinning

Details Free precession of neutron stars - Role of possible vortex pinning Free precession of neutron stars - Role of possible vortex pinning

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..251s&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 251-260. Research supported by the U.S.-Israel Binational Science Fou

Astronomy and Astrophysics

Astrophysics

96

Moments Of Inertia, Neutron Stars, Precession, Stellar Models, Stellar Rotation, Angular Velocity, Binary Stars, Ideal Fluids, Magnus Effect, Vorticity, X Ray Sources

Scientific paper

Vortex pinning affects neutron-star free precession by modifying its frequency and geometry, in a gyroscopic effect. For neutron stars with low oblateness, the free-precession frequency is given by the product of the ratio of moments of inertia of the pinned superfluid to the rigid component of the rest of the star times half the superfluid vorticity. This poses a severe difficulty for any interpretation of the 35-day cycle of Her X-1 in terms of neutron-star wobble if vortex pinning exists.

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