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We present relativistic hydrostatic equations for obtaining irrotationalbinary neutron stars in quasi equilibrium states in 3+1 formalism. Equationsderived here are different from those previously given by Bonazzola,Gourgoulhon, and Marck, and have a simpler and more tractable form forcomputation in numerical relativity. We also present hydrostatic equations forcomputation of equilibrium irrotational binary stars in first post-Newtonianorder.Comment: 5 pages, corrected eqs.(2.10), (2.11) and (3.1

Relativistic formalism for computation of irrotational binary stars in quasiequilibrium states