Progenetor systems for research would be a Be-star surrounded by a ultrahot but small star; less massive star (fhe prematurely ended core of the main star after the mass transfer and on it) this phase might last a few 100 thousands years up to many maybe million years, until The originally main star expods.
Progenitor systems for research would be a Be-star surrounded by an ultrahot but smaller and less massive star (the prematurely ended core of the main star after the masstransfer). This phase might last a few 100 thousand years up to maybe a million years, until the originally main star expodes.