AAS 203rd Meeting, January 2004
Session 12 Eclipsing Binary Stars
Poster, Monday, January 5, 2004, 9:20am-6:30pm, Grand Hall

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[12.18] A Far-Ultraviolet Spectroscopic Survey of RS CVn Binary Systems

S. Redfield (McDonald Observatory, University of Texas), J.L. Linsky (JILA, University of Colorado and NIST), T.R. Ayres, A. Brown (CASA, University of Colorado), G.J. Herczeg (JILA, University of Colorado and NIST)

RS CVn systems are detached late-type binaries that are very active as a result of their tidally-enforced rapid rotation. They are actively studied and bright at X-ray and ultraviolet (UV) wavelengths, but very few have been observed in the far-UV. We present multiple orbital phase observations of RS CVn systems taken by the Far Ultraviolet Spectroscopic Explorer (FUSE). Located in the FUSE spectral range are emission lines formed in plasma at 50,000-300,000 K (e.g., C III and O VI). We present an analysis of the strong emission line profiles. By monitoring the change in the profile shape over the course of an orbital period we can measure the fractional contributions of each star in the RS CVn binary system at different plasma temperatures. In addition, the spectral resolution and wavelength scale of FUSE permit us to measure the width and velocity shift of the O VI and C III lines, providing a new window on stellar atmospheric dynamics and structure.

If you would like more information about this abstract, please follow the link to http://origins.colorado.edu/~sredfiel. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: sredfield@astro.as.utexas.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.