Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2331l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Nov. 1985, p. 2331-2334.
Astronomy and Astrophysics
Astronomy
17
Infrared Astronomy, Luminosity, Spatial Resolution, Water Masers, Color, Infrared Telescopes, Stellar Evolution
Scientific paper
Small-aperture diffraction-limited scans of IRc2/KL at 7.8 and 12.5 μm are discussed. These scans, which were made at several position angles, spatially resolve the region within a 250 AU radius of this source, which is thought to be a newly formed luminous star undergoing heavy mass loss. IRc2 is found to have a pronounced elongation. The shape and orientation of this extended structure is similar to that seen on a larger scale in low-excitation molecular transitions, and is very similar to the distribution of H2O "shell" masers. The size of the object may be reconciled with its dereddened blackbody temperature and total luminosity of 105L_sun; (which is appropriate to OMC1) by the presence of small-scale structure. The observations thus support the idea that IRc2 is the primary luminosity source for OMC1. New astrometric measurements indicate that the 12.5 μm peak of IRc2 is coincident with the positions of the two bright SiO masers to within 0.3arcsec.
Becklin Eric E.
Genzel Reinhard
Lester Dan F.
Wynn-Williams C. G.
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