AAS 206th Meeting, 29 May - 2 June 2005
Session 40 Binary Stars
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[40.04] Radiatively Driven Surface Flows in Close Hot-Star Binaries

K. G. Gayley, A. J. Onifer, J. Parsons (University of Iowa), R. Townsend, S. P. Owocki (University of Delaware)

The radiative equilibrium condition at the surface of stars in close binaries requires that there be no net flux normal to the surface, but within a skin depth there will be net flux transverse to the surface. We investigate the possible consequences of such a transverse flux, and show for a plausible range in the uncertain transverse viscosity that surface flows of order the sound speed are possible. The observable consequences of such flows are an alteration of the rotationally broadened line shapes, in a manner consistent with the so-called ``Struve-Sahade effect'' in He I resonance lines.

The first author would like to acknowledge funding from the National Science Foundation (AST 00-98155).

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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.