Comment on "Instabilities in Close Neutron Star Binaries"
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In a recent Physical Review Letter, Wilson and Mathews presented some interesting numerical calculations of a system of two equally massive neutron stars in strong-field gravity. In particular they estimated the innermost stable circular orbit in their system. Here we point out a possibly important consequence of their results: Their calculated configurations have total angular momentum $J$ and total mass $M$ too large to form any Kerr black hole: $J>M^2$, in constrast to previous calculations of the innermost stable circular orbit.
3 pages LaTeX (revtex, epsf) and 1 figure; figure also available at ftp://ftp.itp.ucsb.edu/figures/nsf-itp-95-165.eps
3 pages LaTeX (revtex, epsf) and 1 figure; figure also available at ftp://ftp.itp.ucsb.edu/figures/nsf-itp-95-165.eps