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.
