Contact binary
In astronomy, the term contact binary refers to two astronomical bodies that are so close that they touch each other. Normally, the term may refer either to stars (see Binary star) or to asteroids.
Asteroids ...
Contact binary
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Contact Binary: In these binary stars, components are too close together that they have material exchange. The mutual gravity may also deform the stars and glue them together.
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.
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.
44 Boötis is classified as an eclipsing variable of W Ursae Majoris type (that also resembles U Pegasi) because Star B has a double-lined, spectroscopic companion that is close enough to be considered a (weak thermal) shallow contact binary (Hill et ...
[7525] pi Scorpii, another multiple star system, is composed of a contact binary star of the Beta Lyrae type and a fainter, more distant companion. Both components of the contact binary are hot blue-white dwarfs.
If both stars overflow their Roche lobes, a contact binary results. Stellar evolution in binaries can produce states not achievable in single stars. In a sufficiently wide binary, both stars evolve as though they were isolated.
do not eclipse one another may have variable stellar spectra caused by the Doppler effect as they orbit around one another, and are called spectroscopic binaries. Some binary stars are so close together that they touch, and form a contact binary.
If one of the stars is big enough to transfer mass through the Lagrange point then the system is a semidetached binary. If both stars fill their Roche lobes then the system is known as a contact binary.
 See also: Star, Binary star, Binary system, Astronomy, Aries
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