Common Envelope - A stage in the evolution of a close pair of stars in which matter shed by one of the stars fills the region just outside the Roche lobes of the two stars ...
25143 Itokawa, recently photographed by the Hayabusa probe, also appears to be a contact binary which has resulted in an elongated, bent body.
Stars: Common envelope binaries
* W Ursae Majoris variable
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*Binary system (astronomy) ...
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This article is about contact binary stars. For asteroids, see Contact binary (asteroid).
The freed matter is either redistributed within a common envelope or is entirely lost from the binary system. This interaction between the halos changes the orbits of the galaxies, which tend to spiral toward each other, eventually merging.
The two stars now share a common envelope, causing their mutual orbit to shrink. The giant star then sheds most of its envelope, losing mass until it can no longer continue nuclear fusion.
Contact Binary: Two stars in a binary system that are so close together that they share a common envelope of gas. There gravitational fields overlap and the stars form a "peanut" shaped object, like a double-cored, "figure 8" object.
According to Matthews, Morgan and Schmidt (1964, Ap.J., 140, 35) Dumbbell (db) Galaxies are a group of objects allied to the D ("dustless") galaxies, in which two, separated but approximately equal-sized nuclei are observed in a common envelope.
In more extreme cases, the lost matter can encompass both stars, creating a "common envelope." Friction will then bring the stars even closer together, making the process go yet faster.
These include common envelopes, shells, bridges, and tails, which may consist of distorted spiral arms or separate features. These tell us about the victim galaxy's dynamics and the geometry of the tidal disturbance.
contact binary A binary star system in which both stars have expanded to fill their Roche lobes and the surfaces of the two stars merge. The binary system now consists of two nuclear burning stellar cores surrounded by a continuous common envelope.
(b) A name given to the long HI filament that extends from the region between the Magellanic Clouds down to the south galactic pole and which appears to make a 180° arc of a great circle across the sky.
(c) A name given to the common envelope of ...
 See also: Astronomy, Star, Galaxy, Cluster, Ray
  
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