This entry is missing Overview , add relevant content to make the entry more complete, and it can also be upgraded quickly. Hurry up edit Come on! Mass exchange is a phenomenon that the surface matter of one sub star in a close binary transfers to another sub star. Mass exchange usually occurs when a stellar wind or surface explosion occurs on the surface of a sub star, or when the volume of the sub star expands to the internal critical equipotential plane.
- Chinese name
- Quality communication
- Foreign name
- mass exchange
- Author
- Zhai Disheng
- Purpose
- Explain some special phenomena in the binary world
Due to the mass exchange, the orbital period of the binary will change, the radial velocity curve and the light variation curve of the eclipsed binary will also be distorted, and some gas emission lines will appear on the specific phase of the orbital movement. These phenomena have been confirmed by observation. The relative scale of mass exchange varies from large to small. For example, the mass transfer rate of Gradual Taiwan II (Beta Lyra) is estimated to reach 10 to 10 solar masses every year. During the mass exchange of close binary stars, the material flow thrown from A sub star to B sub star may directly fall on the surface of B sub star, or form a gas ring or disk rotating around B sub star Peristellar matter 。 Mass exchange is a common phenomenon in close binaries. Because of the mass exchange, the evolution process of the sub stars in a binary star is different from that of a single star. These sub stars are not only controlled by the nuclear reaction process, but also affected by the dynamic evolution process of binary stars with mass exchange. For example, a sub star with a mass less than 3 solar masses can directly evolve into a low luminosity white dwarf without going through the red giant stage due to mass exchange. Mass exchange is also used to explain some special phenomena in the binary world. For example, compact stars (white dwarfs or neutron stars) in close binary stars become an X-ray source because they accrete the material flow of companion stars in mass exchange; for example, nova, special star A, wire star A B-type emission star The physical state and evolution of special celestial bodies such as Wolf Rayet may also be related to the mass exchange of binary stars. 
