The YSO LkHα 234 Outflow. Fluorescence in the Near Infrared.

Details The YSO LkHα 234 Outflow. Fluorescence in the Near Infrared. The YSO LkHα 234 Outflow. Fluorescence in the Near Infrared.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.5006n&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #50.06; Bulletin of the American Astronomical Society, Vol. 28, p.1340

Astronomy and Astrophysics

Astronomy

Scientific paper

Near infrared images at the 2.121mu m line of H_2 and nearby continuum of the LkHα 234 outflow obtained with the APO 3.5m telescope and GRIM II IR camera are presented. Optical images [1] have shown a collimated jet arising from a Herbig Ae/Be star and into a cavity surrounded by a dense cloud. The eastern edge of the cloud is seen as a snaking 'reflection nebula'. The IR images show the jet [1][2] and some evidence for a counter-jet, but also that the 'reflection snake' is bright and well defined in the 2.121mu m line. The spectrum of a small section of this snake obtained with the MMT and Rieke FSPEC IR spectrometer confirms that the IR emission is not due to reflection. The spectrum shows no Brgamma emission, but displays a number of H_2 features including a strong 8-6 O(3) 2.0412mu m line. This line appears in planetary nebulae and is considered a clear evidence of fluorescence [3]. The high luminosity Herbig Ae/Be source that drives the outflow could be also responsible for the H_2 fluorescent emission. [1] Ray, Poetzel, Solf & Mundt (1990). ApJ, 357, L45. [2] Cabrit, Lagage, McCaughrean & Olofsson (1996). Preprint. [3] Shupe, Larkin, Knop, Armus, Matthews & Soifer (1996). Preprint.

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