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T.R. Ayres, A. Brown, G. M. Harper (CASA), H. Korhonen (AIP), S. Redfield (U. Texas), S.L. Hawley (U. Washington), Optical Support Team
A week-long pointing on the short-period eclipsing RS~CVn binary AR~Lac (K0IV+G4IV; P=2d) by the {\em Far-Ultraviolet Spectroscopic Explorer}\/ was coordinated with groundbased optical Doppler mapping, to provide an unprecedented view of structure, energetics, and dynamics of subcoronal activity, through time-resolved measurements of FUV diagnostics like C~{\small III}~\lambda977, O~{\small VI}~\lambda1031, and (coronal forbidden line) Fe~{\small XVIII}~\lambda974. The observation was carried out over the period 29~November to 7~December 2004, with a total exposure of 225~ks, covering four revolutions of the binary. Three large flares were captured during this period, and numerous smaller ones, mainly on the K subgiant primary. We discuss the appearance of the FUV activity on the surfaces of the two hyperactive companions, with special emphasis on the eclipse intervals.
This work was supported by a {\em FUSE}\/ Guest Investigator grant.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.