Physics – Optics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20923807p&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #238.07; Bulletin of the American Astronomical Society,
Physics
Optics
Scientific paper
Spitzer has unparalleled sensitivity to infrared excesses around young stars due to circumstellar dust, but can only spatially resolve the closest few systems. Large, ground-based telescopes with their higher angular resolution play a key role in studying the close environments of these stars. I will present mid-infrared imaging that spatially resolves circumstellar dust on subarsecond scales around more than a dozen Herbig Ae/Be stars. These 10-18 um observations were obtained using LWS on Keck I and Michelle on Gemini North. The observed dust geometries variously take the form of circumstellar disks, bipolar envelopes, and extended asymmetric nebulae. Many Herbig Ae/Be stars have very complex circumstellar environments, frequently including deeply embedded companions and/or complicated streamers and arcs of dust, along with circumstellar disks traced by scattered light, thermal emission, and PAHs. Understanding these complex environments will require sophisticated multiwavelength analyses which incorporate mid-infrared imaging along with optical imaging from HST, near-infrared adaptive optics imaging and polarimetry, and millimeter interferometry.
Graham James R.
Perrin Marshall D.
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