Title: The dynamical stability of W Ursae Majoris-type systems Authors: Lifang Li, Fenghui Zhang Theoretical study indicates that a contact binary system would merge into a rapidly rotating single star due to tidal instability when the spin angular momentum of the system is more than a third of it...
W Ursae Majoris (W UMa) is a variable star in the constellation Ursa Major. It is an eclipsing contact binary whose two component stars share a common outer layer, and is the prototype of a class of contact binary variables known as W Ursae Majoris variables. [url=http://en.wikipedia.org/wiki/W_...