O type stars don’t last long they’re large and so burn fuel faster and are far brighter. However, if these two stars evolved as a binary system, the black hole

O type stars don’t last long they’re large and so burn fuel faster and are far brighter. However, if these two stars evolved as a binary system, the black hole star would have been brighter to have gone through a super nova first. Can an O type star still be an O type star after its close neighbour blows up and produces a black hole? It couldn’t be a stellar capture could it, the capture would need to lose a huge amount of relative velocity. I guess I just need to read the paper.