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Title:
Magnetic neutron star equilibria with stratification and type II superconductivity
Authors:
Lander, S. K.; Andersson, N.; Glampedakis, K.
Affiliation:
AA(Mathematical Sciences, University of Southampton, Southampton SO17 1BJ; Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Potsdam-Golm 14476, Germany), AB(Mathematical Sciences, University of Southampton, Southampton SO17 1BJ), AC(Theoretical Astrophysics, University of Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 1, pp. 732-747. (MNRAS Homepage)
Publication Date:
01/2012
Origin:
WILEY
Astronomy Keywords:
MHD, stars: magnetars, stars: magnetic field, stars: neutron
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:
10.1111/j.1365-2966.2011.19720.x
Bibliographic Code:
2012MNRAS.419..732L

Abstract

We construct two-fluid equilibrium configurations for neutron stars (NSs) with magnetic fields, using a self-consistent and non-linear numerical approach. The two-fluid approach - likely to be valid for large regions of all but the youngest NSs - provides us with a straightforward way to introduce stratification and allows for more realistic models than the ubiquitous barotropic assumption. In all our models, the neutrons are modelled as a superfluid, whilst for the protons we consider two cases: one where they are a normal fluid and another where they form a type II superconductor. We consider a variety of field configurations in the normal-proton case and purely toroidal fields in the superconducting case. We find that stratification allows for a stronger toroidal component in mixed-field configurations, though the poloidal component remains the largest in all our models. We provide quantitative results for magnetic ellipticities of NSs, both in the normal- and superconducting-proton cases.
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