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Paper: Surface Flows and the Struve-Sahade Effect
Volume: 367, Massive Stars in Interactive Binaries
Page: 393
Authors: Gayley, K.G.; Townsend, R.; Parsons, J.; Owocki, S.
Abstract: The Struve-Sahade effect is the tendency for double-line spectroscopic hot-star binaries to show anomalously deeper absorption in the blueshifted profile, particularly for the secondary. This effect breaks the expected profile reflection symmetry at mirror opposite phases, which is not easily done. It was suggested at the meeting in Les Isles-de-la-Madeleine that this effect might be explained by surface flows induced by irradiation from the companion, but no effort was made to constrain the observational characteristics of such a flow. Here we apply a binary synthesis code to the generation of observable line profiles to characterize the required flow speed and geometry, and argue that the generation of such flows is a plausible, though not proven, explanation for the source of the Struve- Sahade effect.
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