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Title:
Infrared imaging of the compact H II region W3A
Authors:
Hayward, Thomas L.; Grasdalen, Gary L.; Woodward, Charles E.; Hackwell, John A.; Gehrz, Robert D.; Pipher, Judith L.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Wyoming Infrared Observatory, Laramie), AC(Wyoming Infrared Observatory, Laramie), AD(Aerospace Corp., Space Sciences Laboratory, Los Angeles, CA), AE(Minnesota, University, Minneapolis)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 15, 1989, p. 894-905. Research supported by Aerospace Corp., NSF, USAF, and University of Minnesota. (ApJ Homepage)
Publication Date:
10/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
H II REGIONS, INFRARED SOURCES (ASTRONOMY), NEBULAE, ASTRONOMICAL MAPS, BROADBAND, INTERSTELLAR EXTINCTION, MOLECULAR CLOUDS, POINT SOURCES
DOI:
10.1086/167959
Bibliographic Code:
1989ApJ...345..894H

Abstract

The H II region W3A was imaged and mapped at five broad-band wavelengths from 1.65 to 20 microns and at CVF resolution in the Br-gamma line at 2.17 microns and in the nearby continuum. A newly discovered source called IRS 2c appears to be a highly reddened star similar to IRS 2. IRS 11 is another previously undetected source that lies between W3A and W3 IRS 5. The 1-20 micron spectrum of IRS 11 is due to warm dust and has a moderate silicate absorption at 9.7 microns. The most interesting source first shown on the maps, called IRS 2b, appears to be a reddened star surrounded by a centrally condensed cloud of hot dust. It is suggested that IRS 2b is a young star in a dust-clearing phase. The maps also reveal that the dust-to-gas emission ratio appears to be variable within W3A.

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