The infrared properties of compact galactic radio sources - The young and the restless

Details The infrared properties of compact galactic radio sources - The young and the restless The infrared properties of compact galactic radio sources - The young and the restless

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..148w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 148-162.

Astronomy and Astrophysics

Astronomy

39

Galactic Structure, H Ii Regions, Infrared Spectra, Point Sources, Radio Sources (Astronomy), B Stars, Infrared Astronomy Satellite, O Stars, Planetary Nebulae, Stellar Evolution

Scientific paper

The 20 cm Galactic plane survey (GPS) of Zoonematkermani et al. (1990) and the IRAS Point Source Catalog are compared using a new technique for distinguishing chance from true coincidences. The comparison shows that the GPS/IRAS sources are Galactic. Several classes of objects are identified. Most are shown to be ultracompact H II regions distributed with amazingly small scale height of 30 pc. It is shown that the IRAS-selected sample of UC H II regions of Wood and Churchwell (1989) is significantly contaminated by objects with a much thicker latitude distribution, which accounts for the larger scale height in that study. It is argued that only the combination of IR and radio observations can distinguish massive embedded O stars from the more numerous, lower mass embedded B stars. Practically all of the radio-selected PNs in the survey area have essentially identical IRAS colors, suggesting that they are in very similar evolutionary states.

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