I have really no idea how to define the rho, theta, and phi limits for this question. Please help!!

Suppose that the density at a point in a gaseous spherical star is modeled by the formula

delta = deltasub0 times e^ -(rho/R)^3

where deltasub0 is a positive constant, R is the radius of the star, and rho is the distance from the point to the star's center . Find the mass of the star.