AAS 207th Meeting, 8-12 January 2006
Session 10 Circumstellar Disks II
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[10.08] Discovery of a Circumstellar Disk Around HD 97048 with HST Coronagraphic Imaging

R. L. Doering (UIUC and STScI), M. Meixner, S. T. Holfeltz (STScI), D. R. Ardila (Spitzer Science Center), M. Clampin (NASA Goddard Space Flight Center), J. E. Krist, S. H. Lubow (STScI)

We carried out a coronagraphic imaging study of six Herbig Ae/Be stars using the Hubble Space Telescope Advanced Camera for Surveys in order to spatially resolve the distribution of circumstellar material around these young stars. Our primary objective in obtaining resolved images of our targets is to measure disk sizes and examine the morphology of their circumstellar material. All of our targets have well-constrained spectral energy distributions and are nearby (< 200 pc). The observations were made through the F606W (broad V) filter with the 1.8 arcsec occulting spot. A point-spread function reference star was selected for each target based on the following criteria: proximity to the target, V-magnitude brighter than the target, similar (B-V) color and spectral type. The scattered-light images reveal circumstellar material around one target, HD 97048. The star is located in a nebulous region at a Hipparcos distance of 175 pc and has a spectral type of A0. The material appears to have spiral structures and extends to a distance of ~3.7 arcsec from the central star. Upper limits to disk size and brightness will be placed on the targets with non-detections. We will use an axisymmetric radiative transfer dust code and the constraints from our observations to derive basic physical parameters of the dusty circumstellar matter such as mass, geometry, inclination angle, and grain properties. NASA/STScI GO-10425.01 supported this work.

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