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Detached, Semidetached, Contact, and Over-Contact Binaries

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Detached, Semidetached, Contact, and Over-Contact Binaries
(a) In a detached binary, neither star fills its Roche lobe. (b) If one star fills its Roche lobe, the binary is semidetached. Mass transfer
is often observed in semidetached binaries. (c) In a contact binary, both stars fill their Roche lobes. (d) The two stars in an
over-contact binary both overfill their Roche lobes. The two stars actually share the same outer atmosphere.
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