Astronomers have observed direct evidence of a shared envelope in the binaries. Many stars have companion stars, and in the process of evolution, binary stars will form double black holes, double neutron stars and other celestial bodies. In 1976, scientist Bohdan Paczyński put forward theoretical predictions that binary stars have an evolutionary process of “shared envelope”, which will profoundly affect the fate of binary stars. But so far astronomers have not really observed the existence of a shared envelope. Scientists from China and Australia discovered a hot subdwarf binary star J1920 at a distance of 23,000 light-years in the southern hemisphere through the 2.3-meter wide-field telescope of the Australian National University and the Kepler satellite. The analysis found that the two stars are getting closer and closer, with an expanding shell around them, leaving the binary at about 200 kilometers per second. The astronomers explained, “One star in the binary expands violently due to material loss, wrapping the other star in an outer envelope, forming a common envelope. At this point, the entire binary system looks like a double-yolked egg, The two yolks are the stars themselves, and the egg whites are the shared envelope.” The study was published in the journal Monthly Notices of the Royal Astronomical Society.
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