Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..196a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 196-202. DFG-supported research.
Astronomy and Astrophysics
Astrophysics
23
Neutron Stars, Precession, Stellar Interiors, Stellar Rotation, Superfluidity, X Ray Binaries, Creep Properties, Energy Dissipation, Euler Equations Of Motion, Stellar Cores, Stellar Models, Vortices
Scientific paper
The authors consider the dynamics of the superfluid interior of a precessing neutron star. They formulate Euler's equations with the current models of internal torques and find that the superfluid interior of the star has steady states in which the interior follows the crust's precession. Using the current understanding of the neutron star interior based on observations of radio pulsars, the authors calculate the internal torques and energy dissipation rates. They show that the torques do not exceed those available in the Her X-1/HZ Her binary system. They discuss the implications of interpreting the 35 day cycle turn-on fluctuations of Her X-1 in terms of fluctuating internal pinning torques and show that this would lead to a large energy dissipation that is not compatible with the observations.
Alpar Alan
Oegelman Hakki
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