A class of charged analogues of Durgapal and Fuloria superdense star

A class of charged analogues of superdense star model due to M.C. Durgapal and R.S. Fuloria, is obtained by using a particular electric field, which involves a parameter K. The members of this class are seen to satisfy the various physical conditions e.g. c(2)rho >= 3p >= 0, dp/dr < 0, d rho/dr < 0, along with the velocity of sound condition dp/c(2)d rho < 1 and the adiabatic index ((p + c(2)rho)/p)(dp/(c(2)d rho)) > 1 for the interval 1 < K <= 1.73 with the maximum mass 3.2860 M-Theta and the radius 18.3990 km. It is interesting to note that the velocity of sound and the ratio p/c(2)rho are monotonically decreasing towards the pressure free interface for 1 < K <= 1.10216 which presents a relevant modelling for massive star like Neutron star or pulsar. In the interval 1 < K <= 1.10216, the maximum mass and the corresponding radius are given as 1.9672 M-Theta and 15.9755 km respectively.