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Session 45 - Eclipsing Binaries.
Display session, Thursday, January 08
Exhibit Hall,

[45.15] High-resolution Infrared Spectroscopy of Starspots on RS CVn Stars

D. O'Neal (JILA/Colorado), J. E. Neff (College of Charleston), S. H. Saar (CfA)

We present results from a study of magnetically active stars using the PHOENIX infrared spectrograph at KPNO. We constrain starspot coverages on RS CVn stars using high-resolution observations of two temperature-sensitive OH lines near 1.563\mum (6397 cm^-1). The use of these features holds two advantages over the TiO bands that we have used previously: the OH lines are visible in spots up to \sim4500 K; and spots are much brighter, relative to the unspotted photosphere, in the infrared than in the visible. These properties also make these OH lines excellent candidates for the first Doppler imaging study to use high-resolution observations of infrared spectral features. Using the OH lines, we also search for previously unknown secondary stars in ``single-lined'' RS CVn binary systems, including II Pegasi (HD 224085).

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