In a detached binary, neither star fills its Roche lobe, so that there is no significant mass transfer between the components. In a semidetached binary, one of the stars fills its Roche lobe, which results in this star losing material in a matter stream that either falls directly onto its companion, or, as is more usual, that enters an accretion disk. In a contact binary both components fill their Roche lobes or, more often, overflow them so that there is a common convective envelope.
The proximity of stars in close binaries typically stretches at least one component into an ellipsoidal variable, and often produces an eclipsing binary as well.
Related categories• TYPES OF STAR
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