Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 419, Issue 1, Pages 732-747Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.19720.x
Keywords
MHD; stars: magnetars; stars: magnetic field; stars: neutron
Categories
Funding
- European Science Foundation (ESF)
- STFC in the UK [ST/H002359/1]
- Alexander von Humboldt fellowship
- German Science Foundation (DFG) [SFB/TR7]
- Science and Technology Facilities Council [ST/H002359/1] Funding Source: researchfish
- STFC [ST/H002359/1] Funding Source: UKRI
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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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