[Space] Various Star System Generation Thoughts and Questions

[Anthony]

Originally Posted by Nemoricus

1. The rules for stellar orbits combined with those for stellar evolution occasionally produce a star that is inside another. In all cases I've examined so far, this occurs when one star grows into the red giant stage, and especially one of the cooler ones with correspondingly larger radius.

I believe this situation is realistic, but results in nonstandard stellar evolution when it occurs (it looks it's probably a common envelope. Actually, this looks like it's a fairly direct study of the situation.