Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2434i&link_type=abstract
"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R
Physics
Scientific paper
We present one possible mechanism for the giant flares of the Soft Gamma-Ray Repeaters (SGRs) within the framework of magnetar, i.e., superstrongly magnetized neutron star model, motivated by the positive period increase associated with the August 27 event from SGR 1900+14. We assume that the global reconfiguration of the internal magnetic field suddenly occurs. Then, the shape of the star is deformed due to the change in the internal hydromagnetic stresses, and this deformation causes the moment of inertia to increase and the total energy to decrease, since the star can be prolate rather than oblate. With the internal field of H ≳ 1016 G, we can explain the positive period increase ΔPt/Pt ~ 10-4 as well as the energy ≳ 1044 ergs of the giant flares. In this mechanism, since the oscillation of the neutron star will be excited, a pulsation of ~ ms period in the burst profile and an emission of the gravitational waves (GWs) are expected. The GWs could be detected by the planned interferometers such as LIGO, VIRGO and LCGT.
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