TORSIONAL NODELESS VIBRATIONS OF A QUAKING NEUTRON STAR RESTORED BY THE COMBINED FORCES OF SHEAR ELASTIC AND MAGNETIC FIELD STRESSES

作者：С. И. Баструков, Gaoting Chen, Hsiang‐Kuang Chang, I. V. Molodtsova, D. V. Podgainy · 发表于：The Astrophysical Journal · 年份：2008 · DOI：10.1088/0004-637x/690/1/998 · 被引用次数：11 · 研究领域：Pulsars and Gravitational Waves Research、High-pressure geophysics and materials、Geophysics and Sensor Technology

Within the framework of Newtonian magneto-solid mechanics, relying on equations appropriate for a perfectly conducting elastic continuous medium threaded by a uniform magnetic field, the asteroseismic model of a neutron star undergoing axisymmetric global torsional nodeless vibrations under the combined action of Hooke's elastic and Lorentz magnetic forces is considered with emphasis on a toroidal Alfvén mode of differentially rotational vibrations about the dipole magnetic-moment axis of the star. The obtained spectral equation for frequency is applied to ℓ-pole identification of quasi-periodic oscillations (QPOs) of the X-ray flux during the giant flares of SGR 1806-20 and SGR 1900+14. Our calculations suggest that detected QPOs can consistently be interpreted, within the framework of this model, as being produced by global torsional nodeless vibrations of a quaking magnetar if they are considered to be restored by the joint action of bulk forces of shear elastic and magnetic field stresses.