Binary Neutron-Star Systems: From the Newtonian Regime to the Last Stable Orbit

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  • 27 March 1998
Abstract
We report on fully relativistic circular orbit calculations of a binary system composed of two identical corotating neutron stars. Using a conformally flat spatial metric we find solutions to the initial value equations that correspond to semi-stable circular orbits. This is the first calculation to span a range of separation distances from the innermost stable circular orbit (ISCO), deeply inside the strong field regime, to a distance (~ 200 km) where the system is accurately described by Newtonian dynamics. At large distance, our numerical results agree exceedingly well with the Newtonian limit. We also present a fully relativistic determination of the ISCO for different stellar masses.

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