Summary
There are several ways in which triple stars can evolve in somewhat unusual ways. We discuss two: situations where Case A Roche-lobe overflow, followed by a merger, can produce anomalous wide binaries such as γ Per; and Kozai cycles in triples with non-parallel orbits, which can produce merged rapidly-rotating stars like (we suggest) AB Dor, and which can also lead to the delayed ejection of one component of a multiple, as may have been observed in T Tau in 1998.
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Eggleton, P., Kisseleva-Eggleton, L. (2008). Evolutionary Processes in Multiple Systems. In: Hubrig, S., Petr-Gotzens, M., Tokovinin, A. (eds) Multiple Stars Across the H-R Diagram. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74745-1_1
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DOI: https://doi.org/10.1007/978-3-540-74745-1_1
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