spatially inhomogeneous chemical composition

The generalized polytropic model for the Sun-like stars

The Eddington method based on simultaneous consideration of gas and light pressures with a homogeneous сhemical composition of stellar matter was generalized for the case of model with a spatially inhomogeneous chemical composition.  As a result, it was obtained the equation of state, which is expressed by a generalized polytrope with index $n=3$.  As an example, it was solved the equilibrium equation for the Sun both using the standard polytropic equation of state and generalized polytrope.  The coordinate dependence of the Sun characteristics was calculated within two