Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-03-03
Mon.Not.Roy.Astron.Soc.397:913,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
13 pages, 12 figures. Minor changes to match the version published on MNRAS
Scientific paper
10.1111/j.1365-2966.2009.14990.x
We find general relativistic solutions of equilibrium magnetic field configurations in magnetars, extending previous results of Colaiuda et al. (2008). Our method is based on the solution of the relativistic Grad-Shafranov equation, to which Maxwell's equations can be reduced in some limit. We obtain equilibrium solutions with the toroidal magnetic field component confined into a finite region inside the star, and the poloidal component extending to the exterior. These so-called twisted-torus configurations have been found to be the final outcome of dynamical simulations in the framework of Newtonian gravity, and appear to be more stable than other configurations. The solutions include higher order multipoles, which are coupled to the dominant dipolar field. We use arguments of minimal energy to constrain the ratio of the toroidal to the poloidal field.
Ciolfi Riccardo
Ferrari Valeria
Gualtieri Leonardo
Pons Jose A.
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