An interpretation of the radio and IR spectrum of the compact H II regions W 3 /A/ and W 3 /OH/

Details An interpretation of the radio and IR spectrum of the compact H II regions W 3 /A/ and W 3 /OH/ An interpretation of the radio and IR spectrum of the compact H II regions W 3 /A/ and W 3 /OH/

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..441k&link_type=abstract

Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 441-448.

Astronomy and Astrophysics

Astrophysics

29

Cosmic Dust, H Ii Regions, Infrared Spectra, Protostars, Radio Spectra, Interstellar Matter, Ionized Gases, Photoionization

Scientific paper

Models are fitted to the observed integral characteristics and radio as well as IR spectra of the compact H II regions W 3 (A) and W 3 (OH). W 3 (OH) appears to be ionized by an O-star that has not yet reached the main sequence. It is surrounded by a compact dust-depleted H II region. Some distance outside the H II region is a dense shell of gas and dust whose inner radius is between 20 and 40 times the radius of the compact H II region. There does not appear to be a strong density gradient in the ionized gas. W 3 (A) is surrounded by a dense dust-enriched shell of ionized gas embedded in a dense cloud of neutral gas and dust. The diameter of the ionized shell is comparable to the diameter of the neutral shell surrounding the compact H II region W 3 (OH). The two H II regions appear to represent two different stages in the dynamic evolution of compact H II regions in which dust plays the dominant role.

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