Computer Science
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8728483a&link_type=abstract
Unknown
Computer Science
Dynamic Models, Neutron Stars, Precession, Stellar Cores, Stellar Interiors, Stellar Models, Superfluidity, Energy Dissipation, Euler Equations Of Motion, Torque
Scientific paper
Euler's equations were formulated with models of internal torques to show that the superfluid interior of Her X1 has steady states in which the interior follows the crust's precisions. The steady state of the core superfluid is determined by the internal torque on it which is linear in the lag between the rotation rates of the superfluid and the crust. The pinned crust superfluid also takes part in the precession through vortex creep; the constraint of absolute pinning is never operative because a steady state exists in the regime where the creep rate is linear in the lag between the pinned superfluid and the crust. Internal torques do not exceed those available in the Her X-1/ HZ Her binary system. Interpreting the 35 day cycle turn-on fluctuations of Her X-1 in terms of fluctuating internal pinning torques leads to a large energy dissipation incompatible with the observations.
Alpar Ali
Oegelman Hakki
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