Chris D. Koresko 1,3, Paul M. Harvey 1, Julian C. Christou 2, Robert Q. Fugate 2 and Wenbin Li 1
1
McDonald Observatory, RLM 16.228, University of Texas, Austin, TX 78712-1083
2
Starfire Optical Range, Kirtland AFB, NM 87117-5776
3
Current address: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
Chris D. Koresko et al 1997 ApJ 485 213
doi: 10.1086/304415
New near-infrared images of the young, nebulous, intermediate-mass (Herbig Ae/Be) star LkHα 198 using direct imaging, adaptive-optics compensated speckle imaging, and standard speckle imaging reveal complex structure in its circumstellar dust distribution. At high resolution, LkHα 198 is found to possess a barlike feature which extends ~3'' from the star in either direction. Geometrical considerations suggest that the bar is unlikely to represent light scattered by either a standard circumstellar disk, a disequilibrium "pseudodisk," or an ambient halo illuminated by starlight escaping along the polar axis of a disk. Its orientation suggests that it may be associated with the fan-shaped nebula that surrounds LkHα 198. The infrared companion 6'' north of the star is found to be significantly extended at near-infrared wavelengths and may be an example of a deeply embedded object with an envelope that is at least partially illuminated from the outside.
Issue 1 (1997 August 10)
Received 1996 December 16 , accepted for publication 1997 March 17
Chris D. Koresko et al 1997 ApJ 485 213