AAS 197, January 2001
Session 8. Circumstellar Matter and Winds
Display, Monday, January 8, 2001, 9:30am-7:00pm, Exhibit Hall

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[8.20] Combining NICMOS Imaging and Mid-infrared Measurements of Circumstellar Disks

A.J. Weinberger (UCLA), E.E. Becklin (UCLA), G. Schneider (U.AZ.), M.D. Silverstone (U.AZ.), B. Zuckerman (UCLA), R. Webb (NASA-Ames), B. Smith (U.Hawaii)

We present high angular resolution near-infrared imaging with HST/NICMOS and mid-infrared imaging and spectroscopy from the Keck Observatory which together elucidate the morphology and composition of circumstellar disks. In particular, we highlight results for HD 141569, TW Hydrae, and HD 34700. HD 141569 is a 5 Myr old AeBe star with a spectrum apparently dominated by PAH emission. TW Hya is of similar age but with a spectrum dominated by silicates. HD 34700 may not be a young object at all but a post-main sequence mass-loss star. Its disk and/or shell is very bright and extended in near-infrared scattered light (NICMOS). All three stars show extended dust emission at mid-infrared wavelengths, which, when combined with their 7 - 13 micron spectra constrain the emissivity and location of their constituent dust.

This work is supported in part by NASA grant NAG 5-3042 and based on observations with the NASA/ESA Hubble Space Telescope and the W. M. Keck Observatory.

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