Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..213k&link_type=abstract
Astrophysical Journal v.485, p.213
Astronomy and Astrophysics
Astronomy
8
Stars: Circumstellar Matter, Ism: Individual Alphanumeric: Lkh Alpha 198, Stars: Pre-Main-Sequence, Techniques: Interferometric
Scientific paper
New near-infrared images of the young, nebulous, intermediate-mass (Herbig Ae/Be) star LkH alpha 198 using direct imaging, adaptive-optics compensated speckle imaging, and standard speckle imaging reveal complex structure in its circumstellar dust distribution. At high resolution, LkH alpha 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 LkH alpha 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.
Christou Julian C.
Fugate Robert Q.
Harvey Paul Michael
Koresko Chris D.
Li Wenbin
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