  In this paper we will discuss charged stars with polytropic equation of
state, where we will try to derive an equation analogous to the Lane-Emden
equation. We will assume that these stars are spherically symmetric, and the
electric field have only the radial component. First we will review the field
equations for such stars and then we will proceed with the analog of the
Lane-Emden equation for a polytropic Newtonian fluid and their relativistic
equivalent. These kind of equations are very interesting because they transform
all the structure equations of the stars in a group of differential equations
which are much more simple to solve than the source equations. These equations
can be solved numerically for some boundary conditions and for some initial
parameters. For this we will assume that the pressure caused by the electric
field obeys a polytropic equation of state too.
