The Eddington factor for radiative transfer in spherical geometry

The present paper shows that, contrary to the statement of Hummer & Rybicki, the half-range method (Wilson & Sen) can handle the outward peaking effect of the radiation field in extensive spherical media. The source function J ( r ) and the Eddington factor f ( r ) = [ K ( r )/ J ( r )] have been calculated by the half-range method with k ( r ) = r−2 for o < r ≼ R , where R = 3 and R = 10. The values for R = 10 are compared with those of Hummer & Rybicki and are found to be in fairly good agreement.