Output

RNS prints out 17 physical quantities upon succesfull computation of a model. These are:

$\epsilon_c$ central energy density

M gravitational mass

M₀ rest mass

R_e radius at the equator (circumferencial, i.e. $2 \pi R_e$ is the proper circumference)

$\Omega$ angular velocity

$\Omega_p$ angular velocity of a particle in circular orbit at the equator

T/W rotational/gravitational energy

$cJ/GM_{\odot}^2$ angular momentum

I moment of inertia (except for nonrotating model)

$\Phi_2$ quadrupole moment (program needs to be compiled on HIGH resolution for this to be accurate)

h₊ height from surface of last stable co-rotating circular orbit in equatorial plane (circumferencial) - if none, then all such orbits are stable

h_- height from surface of last stable counter-rotating circular orbit in equatorial plane (circumferential) - if none, then all such orbits are stable

Z_p polar redshift

Z_b backward equatorial redshift

Z_f forward equatorial redshift

$\omega_c/ \Omega$ ratio of central value of potential $\omega$ to $\Omega$

r_e coordinate equatorial radius

r_p/r_e axes ratio (polar to equatorial)

The following values for the physical constants are used: $c=2.9979 \times 10^{10} {\rm cm/s^{-1}}$, $G=6.6732 \times 10^{-8} {\rm g^{-1} cm^3 s^2}$, $m_B=1.66 \times 10^{-24} {\rm gr}$, and $M_{\odot}=1.987 \times 10^{33} {\rm gr}$. The coordinates of the stationary, axisymetric spacetime used to model the compact star are defined through the metric

$$ds^2=-e^{\gamma+ \rho} \ dt^2 + e^{2 \alpha} \bigl(dr^2 + r^2... ...- \rho} r^2 \sin^2 \theta \bigl( d \phi - \omega dt \bigr)^2.$$ (3)

where the potentials $\gamma, \rho, \alpha$ and $\omega$ are functions of r and $\theta$ only. The matter inside the neutron star is approximated by a perfect fluid.