Rashid Shaisultanov and David Eichler 2009 ApJ 702 L23 doi:10.1088/0004-637X/702/1/L23
Rashid Shaisultanov and David Eichler
Show affiliationsThe effect of magnetic fields on the frequencies of toroidal oscillations of neutron stars is derived to lowest order. We suggest that the fine structure in the quasiperiodic oscillation power spectrum of magnetars following giant flares reported by Strohmayer & Watts is magnetic splitting of degenerate toroidal modes, and we estimate a corresponding crustal magnetic field on the order of 1015 Gauss or more. We suggest that residual m, –m symmetry following such splitting, together with nonaxisymmetric or rotational splitting of the residual symmetry, might allow beating of individual frequency components that is slow enough to be observed.
pulsars: general; stars: magnetic fields; stars: neutron; stars: oscillations (including pulsations); X-rays: stars
97.30.Fi Chemically peculiar stars (Ap, Am, etc.)
97.10.Sj Pulsations, oscillations, and stellar seismology
97.10.Ld Magnetic and electric fields; polarization of starlight
97.30.Nr Flare stars (UV Ceti, RS Canum Venaticorum, FU Orionis, R Coronae Borealis variables, etc.)
Issue 1 (2009 September 1)
Received 2009 April 21, accepted for publication 2009 July 7
Published 2009 August 13
Rashid Shaisultanov and David Eichler 2009 ApJ 702 L23
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