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T.B. Guild, D.W. Koerner (University of Pennsylvania), A.I. Sargent (California Institute of Technology)
We present Keck imaging of the Vega-excess star, 49 Cet, at 17.9 microns. Low-level emission is elongated ~1.5'' about the star at a Position Angle of ~40 degrees. Assuming a Hipparcos distance of 61 pc, this indicates a diameter of ~100 AU for the mid-infrared emission. Preliminary fits of a two-part disk model to both the mid-infrared image and unresolved IRAS fluxes indicate that the disk is composed of an inner tenuous component of warm dust surrounded by a cold dense outer disk.