Quote Originally Posted by xtianstone View Post
Also, if you want to use the same physics of our universe, a white dwarf and black dwarf are all in the same mass range as our sun but each has a significantly lower luminosity. So mass is not equal to luminosity unless you are considering the stars to be of similar age. Is this wrong?

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Yes it is.
As I wrote this applies "For main sequence ". That means that this doesn't apply to giants and dwarfs.
But giants don't last long and white dwarfs (black dwarf don't exist yet in our universe because 14 billions years are too short to cool down a white dwarf) are remnants of a dead star so that normal stars spend most of their life on the main sequence where same mass implies same luminosity.

Now all this is perhaps relevant for your story but not really for your map.