Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..556..197b&link_type=abstract
EXPLOSIVE PHENOMENA IN ASTROPHYSICAL COMPACT OBJECTS: First KIAS Astrophysics Workshop. AIP Conference Proceedings, Volume 556,
Astronomy and Astrophysics
Astrophysics
5
Neutron Stars, Pulsations, Oscillations, And Stellar Seismology, Nuclear Matter Aspects Of Neutron Stars, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
We discuss non-radial pulsations of a non-rotating neutron star brought to equilibrium in the state of superparamagnetic magnetization of stellar material. High-lighted are equations of magneto-elastodynamics underlying macroscopic description of large-scale motions of magnetically anisotropic neutron matter possessing properties of elastic Fermi-solid. It is shown that incompressible permanently magnetized nuclear matter can transmit perturbations by transverse magnetoelastic waves. The unique feature of oscillatory behavior of superparamagnetic neutron star is its capability of supporting torsional, differentially-rotational magnetoelastic pulsations. Based on the energy variational principle, analytic form is derived for period of non-radial magnetotorsion pulsations triggering Alfvénic hydromagnetic waves in the neutron star magnetosphere. Our order of magnitude estimates for period of this axial, odd parity magnetotorsion mode, referred to as m/t-mode, suggest that magnetoelastic pulsations may affect curvature radiation from pulsars by shaking magnetic field lines frozen in the neutron star surface, and, thus, producing periodic fluctuations in the beam direction. It is argued that developed model may be worthy of consideration in physics of soft gamma repeaters whose variability may be powered by magnetotorsion pulsations exhibiting superparamagnetism of nuclear matter constituting interior of magnetars. .
Bastrukov Sergey
Podgainy Dmitry
Weber Fridolin
Yang Jongmann
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