One very important process in binary evolution is called common envelope evolution, which profoundly affects the outcome of binary evolution, Zhao Gang, a research fellow at the National Astronomical Observatories of Chinese Academy of Sciences, explained.Ĭommon envelopes were first postulated in 1976, and have been widely used as the explanation for the formation of double black holes, double neutron stars, double white dwarfs and many other compact binaries. It said the envelope is leaving the binary system at a velocity of about 200 kilometers per second.īinary systems in the universe account for more than half of all the stars, and they exist in mutual orbits under gravity. The study, co-led by Han Zhanwen with the Yunnan Observatories and Chris Wolf with the Australian National University, has been published on the Monthly Notices of the Royal Astronomical Society. The groundbreaking discovery is believed to open up a new chapter for scientists to accurately characterize this important process of common envelope evolution of binary systems through astronomical observations. Chinese and Australian astronomers have jointly discovered a binary system that has just experienced a common envelope ejection, the first time in history to have found direct observational evidence for the key process of common envelope evolution, said a study published at a peer-reviewed scientific journal on Thursday, the Global Times learned from the Yunnan Observatories of Chinese Academy of Sciences (YNO).
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