Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.7503h&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #75.03; Bulletin of the American Astronomical Society, Vol. 25, p.925
Astronomy and Astrophysics
Astronomy
Scientific paper
We present H (1.65microns), K (2.23microns), and L'' (3.81microns) broadband images as well as Brgamma (n = 7->4, 2.166microns) and Bralpha (n = 5->4, 4.052microns) hydrogen recombination line images, and 3.29microns, and 3.4microns unidentified feature emission images of the Monoceros R2 star formation region at a plate scale of ~ 0.9'' per pixel. The Brackett line images are combined with radio data to map the line of sight dust extinction to the compact HII region on a small spatial scale. This extinction map is then used to de-redden regions of the H and K images interior to the HII region. IRS1SW, the ionizing source, is found to be consistent with a B0 star. Comparison of de-reddened H and K images with the Brackett images and recent high resolution HCO(+) measurements leads to the development of a torus model for the dense molecular gas surrounding the HII region. The 3.29microns emission is found to be coincident with the ring of scattered light at 2.2microns and just outside the Bralpha and Brgamma emission. The 3.4microns image is of too low S/N to determine if any variation in the 3.29 to 3.4microns emission ratio with distance from the ionizing source is seen, however 3.4microns emission is detected in a ring coincident with the 3.29microns emission.
Forrest William John
Howard Eric M.
Pipher Judith L.
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