where do you expect to find an o−type star
O-type star O-type stars are typically located in regions of active star formation, such as the spiral arms of a spiral galaxy or a pair of galaxies undergoing collision and merger (such as the Antennae Galaxies). These stars illuminate any surrounding material and are largely responsible for the distinct coloration of a galaxy's arms. Furthermore, O-type stars are also frequent in multiple star systems where their evolution is more difficult to predict due to mass transfer and the possibility of component stars going supernova at different times.