«Old, compact star clusters, such as globular clusters, are well known to amateur astronomers,» Professor Forbes said. (keckobservatory.org)
The mass of the hot compact star is only half of the mass of our Sun, and the companion is.7 times the mass of the Sun. (keckobservatory.org)
In that process, the more compact star winds up gaining mass, and the original massive star loses its hydrogen envelope, exposing its helium core to become a Wolf - Rayet star. (sciencedaily.com)