To clarify, I am seeking a mathematical model upon which I can build a program which could populate a fictitious E0 (or spherical dwarf) galaxy with a plausible distribution of stars. I am not looking for the outlying stuff, just the main central sphere and disc portions. From extensive reading I understand that the bulk of luminous bodies will be within the sphere, but I don't know what kind of ratios are realistic. If there is any data regarding types of stars most likely for a given region of a galaxy, that would be useful also. This model need not be rigorous; just good enough to use to make a realistic "looking" galaxy.