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Contact binary

Contact binaries are a type of binary stars where both components of the binary fill their Roche lobes. The uppermost part of the stellar atmospheres forms a common envelope that surrounds both stars. As the friction of the envelope brakes the orbital motion, the stars coalesce in the future, unless something dramatic happens. Example: W UMa




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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Contact binary".