Recently, PhD student Li Fuxing, Prof. Qian Shengbang and their colleagues from Yunnan Observatories of the Chinese Academy of Sciences discovered 12 semidetached mass-transfer massive binaries from a total of 437 eclipsing binaries in Andromeda galaxy (M31). The secondary (less massive) components filled their Roche lobes, while the more massive ones were detached from the lobes.
Click here for original story, Researchers find 12 semidetached mass-transfer massive binaries in galaxy M31
Source: Phys.org