I believe mass of bodies determines characteristics especially if star or not. As such, look at masses of twin stars and of planets in tight orbit. This should yield mass of transition to star. Mass of planet equates to fusion engine modified of course by composition. Big enough and fusion ignites atmosphere and gaseous giant duddenly becomes star.



Also cycle of star is to gather enough mass to become star, expel energy then mass, collapse and attract matter and not expel energy. A "white hole" then is nothing more than a star before collapsing into a black hole. It "ports" energy but only backwards through time, or firward depending upon how you look at it.