Infrared imaging of the compact H II region W3A

Details Infrared imaging of the compact H II region W3A Infrared imaging of the compact H II region W3A

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..894h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 15, 1989, p. 894-905. Research supported by Aerospace Corp., NSF,

Astronomy and Astrophysics

Astronomy

8

H Ii Regions, Infrared Sources (Astronomy), Nebulae, Astronomical Maps, Broadband, Interstellar Extinction, Molecular Clouds, Point Sources

Scientific paper

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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