| Detached |
A binary system where both stars are well within their inner Lagrangian surface. Example System: KP Aql
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| Semi-detached |
One of the stars of the binary completely fills its inner Lagrangian surface; also called Algol systems. Example System: AD Her
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| Near contact |
A semi-detached system where the other component is almost in contact with its inner Lagrangian surface. Example System: V1010 Oph
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| Contact |
System where both stars exactly fill their inner Lagrangian surface. Example System: BX And
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| Overcontact |
A binary system where both stars overfill their inner Lagrangian surface. Example System: AE Phe
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| Double contact |
A binary system where both stars are in contact with their inner Lagrangian surface and one or both stars are in asynchronous rotation. Example System: RZ Sct
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