Analytical model of strange star in the low-mass X-ray binary 4U 1820-30

In this article, we propose a model for a realistic strange star under Tolman VII metric (Tolman, Phys Rev 55:364, 1939 ). Here the field equations are reduced to a system of three algebraic equations for anisotropic pressure. Mass, central density and surface density of strange star in the low-mass X-ray binary 4U 1820-30 are matched with the observational data according to our model. Strange materials clearly satisfy the stability condition (i.e. sound velocities < 1) and TOV equation. Here also the surface redshift of the star is found to be within a reasonable limit.