Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416..719c&link_type=abstract
Astrophysical Journal v.416, p.719
Astronomy and Astrophysics
Astronomy
26
Hydrodynamics, Radiation Mechanisms: Gravitational, Stars: Neutron
Scientific paper
We study the gravitational radiation produced by nonaxisymmetric collisions of identical neutron stars. We model the neutron stars as polytropes and consider both Γ = 5/3 and Γ = 2. The hydrodynamic integration is performed using smooth particle hydrodynamics (SPH). The second derivative of the quadrupole moment of the system is obtained analytically from the SPH equations of motion, so that only one numerical derivative is needed to obtain the gravitational radiation luminosity, greatly reducing the numerical noise in our results. In addition to the intrinsic interest of the problem, these calculations have provided a useful test bed for calibration of our code and comparison with other workers. Waveform and luminosity catalogs are presented for a sequence of parabolic encounters. The amount of energy radiated as gravitational waves peaks at ΔE/M ˜6.5(M/R)7/2 for Γ = 5/3 and ΔE/M 3.7(M/R)7/2 for Γ = 2. Observations of the wave forms may allow different equations of state to be distinguished in some, but not all, cases.
Centrella Joan M.
McMillan Stephen L. W.
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