MERGER OF A NEUTRON-STAR WITH A NEWTONIAN BLACK-HOLE

Newtonian smooth particle hydro simulations are presented of the merge r of a 1.4 M. neutron star with a black hole of equal mass. The initia l state of the system is modeled with a stiff polytrope orbiting a poi nt mass. Dynamical instability sets in when the orbital separation is equal to about three stellar radii. The ensuing mass transfer occurs o n the dynamical timescale. No accretion torus is formed. At the end of the computation a corona of large extent shrouds an apparently stable binary system of a 0.25 M. star orbiting a 2.3 M. black hole.