Axisymmetric toroidal modes of magnetized neutron stars

Umin Lee

研究成果: Article査読

37 被引用数 (Scopus)


We calculate axisymmetric toroidal modes of magnetized neutron stars with a solid crust. We assume the interior of the star is threaded by a poloidal magnetic field that is continuous at the surface with the outside dipole field whose strength Bp at the magnetic pole is Bp ∼ 10 16 G. Since separation of variables is not possible for oscillations of magnetized stars, we employ finite series expansions of the perturbations using spherical harmonic functions to represent the angular dependence of the oscillation modes. For Bp ∼ 1016 G, we find discrete normal toroidal modes which form distinct mode sequences, in each of which the oscillation frequency of the toroidal mode slowly increases as the number of radial nodes of the eigenfunction increases. The frequency spectrum of the toroidal modes for Bp ∼ 1016 G is largely different from that of the crustal toroidal modes of the non-magnetized model, although the frequency ranges are overlapped each other. This suggests that an interpretation of the observed quasi-periodic oscillations (QPOs) based on the magnetic toroidal modes may be possible if the field strength of the star is as strong as Bp ∼ 1016 G.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータスPublished - 2008 4

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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