AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 69. The Young Ones 2: T-Tauri Stars, H-H Objects and Modeling
Display, Wednesday, June 2, 1999, 10:00am-6:30pm, Southwest Exhibit Hall

[Previous] | [Session 69] | [Next]

[69.08] The Circumstellar Environment of Herbig Ae/Be Stars at Mid-IR Wavelengths

L.P. Williams, L.K. Deutsch (Boston Univ.), J.L. Hora, G.G. Fazio (SAO), W.F. Hoffmann (U. Arizona), A. Dayal (IPAC/Caltech)

We present results of mid-IR imaging of three Herbig Ae/Be stars: LkH\alpha 234, HD 200775, and MWC 297. Observations were taken August 3-6, 1994, at the NASA IRTF on Mauna Kea using the MIRAC2 mid-IR camera (Hoffmann et al. 1998). The images were obtained through discrete narrowband filters at 8.8, 10.3, 11.7, 12.5, and 17.2 \mum. These wavelengths cover both continuum and UIR feature emission.

We will present photometry and spatial maps for the objects at all wavelengths observed. The photometry will be compared to a thermal blackbody fit to help identify spectral deviations indicating non-thermal emission in these objects (such as UIR feature emission). For spatially-resolved objects, we will present calculated color temperature and dust opacity maps.

The most interesting of the objects is LkH\alpha 234, which is resolved at all wavelengths observed. This object's emission has spatial structure at UIR wavelengths distinct from the observed continuum distribution. The 10.3 \mum continuum image of the source appears elongated north-south with a protruding southwest extension. The 11.7 \mum image (which samples the 11.22 \mum UIR feature) shows a pronounced east-west elongation and is more extended in overall size than seen at 10.3 \mum. These and other results for the three Herbig Ae/Be stars will be discussed.

If the author provided an email address or URL for general inquiries, it is a s follows:

[Previous] | [Session 69] | [Next]