AAS 207th Meeting, 8-12 January 2006
Session 175 Recent Discoveries in the Far UV
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[175.05] Seven Days in the Life of AR Lac

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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