Summary
We present results of a preliminary investigation of triple star incidence for contact binary stars. The goal is to shed light on the possible role of distant companions which may have acquired and/or absorbed AM during evolution of multiple systems facilitating or enabling formation of contact binaries. We used several techniques but mostly disregarded their detection biases in an attempt to establish a low limit to the frequency of triple systems. The result for the much better observed Northern-sky subsample is 56% ± 8%, whereas subsamples of systems best observed using individual techniques indicate apparent frequencies as high as 60% to 67%; this is consistent with the hypothesis that all contact binary stars exist in multiple systems
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Pribulla, T., Rucinski, S. (2008). Multiplicity of Contact Binary Stars. 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_23
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DOI: https://doi.org/10.1007/978-3-540-74745-1_23
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