Magnetized Neutron stars

Stationary and axisymmetric equilibrium configurations with magnetic field

Bbig is for a relatively large amplitude of the magnetic field: the magnetic pressure over the fluid pressure at the center of the star is about 1%.

Bsmall is for a smaller amplitude of the magnetic field: the magnetic pressure over the fluid pressure at the center of the star is about 10^-4.

Bpretty_small is for a small amplitude of the magnetic field: the magnetic pressure over the fluid pressure at the center of the star is about 10^-8.

Btiny is for a very small amplitude of the magnetic field: the magnetic pressure over the fluid pressure at the center of the star is about 10^-12.

glob_quantities.txt : is a short text file containing the description of the magnetized star, and of its global quantities (mass, radius, magnetic moment...) as they have been calculated by the spectral code magstar.

par_eos.d : the parameters used by magstar for the equation of state.

parrot.d : other parameters used by magstar (central enthalpy, numbers of points, ...)

Rlarge stands for the outer radius of the grid being 2.4 times star's radius.

Rsmall has a ratio of 1.2 between both quantities.

51pts.tar.gz is for a cubic grid of size 51 x 51 x 51

and so on...

Each *pts.tar.gz file contains

size.d : the parameters for the exportation to the cubic grid: first line is the number of points of the cubic grid in each dimension, second is the ratio between the grid dimension and the equatorial diameter of the star.

coordinates.dat : gives a list of the x, y, z coordinates of all grid points. This gives the order in which the grid points are stored for the other fields, meaning that in e.g. density.dat the j^th line gives the density of the j^th grid point which coordinates are given by the j^th line of coordinates.dat.

density.dat : the rest-mass density rho.

velocity.dat : the contravariant form of the coordinate velocity vⁱ.

pressure.dat : the fluid pressure P.

currents.dat : the contravariant form of the 4-currents j^µ.

lapse.dat, shift.dat, metric.dat : the information about the 4-metric in 3+1 form (shift in contravariant and 3-metric in covariant forms).

ext_curvature.dat : the extrinsic curvature in covariant form.

magnetic.dat : the magnetic field in contravariant form.

Note : All data are in International Standard Units (meter, kilogram, second, Ampere), these are recalled in the first line of each file. In particular, the magnetic field is in Tesla: 1 Tesla = 10⁴ Gauss. All vectors and tensors are expressed in a Cartesian triad (d/dx, d/dy, d/dz).