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Magnetic neutron star equilibria with stratification and type II superconductivity
Lander, S. K.; Andersson, N.; Glampedakis, K.
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)
Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 1, pp. 732-747. (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
MHD, stars: magnetars, stars: magnetic field, stars: neutron
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
Bibliographic Code:


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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