Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64..341b&link_type=abstract
Astronomy and Astrophysics, vol. 64, no. 3, Mar. 1978, p. 341-349.
Astronomy and Astrophysics
Astrophysics
19
H Ii Regions, Hydrogen Ions, Hydrogen Recombinations, Interstellar Gas, Radio Spectra, Cold Gas, Continuous Spectra, Ionized Gases, Line Spectra, Mass Flow, Nebulae
Scientific paper
Radio recombination line spectra have been observed at several positions in W33 at 1.7, 5, and 8.6 GHz, and the continuum emission was mapped at 8.6 GHz. In the continuum the source is composed of one major and several minor components. In the lines, two velocity components, which are blended in the observed profiles, are extended across most of the H II region complex. A third velocity component is more localized. The lines at several positions are unusually narrow for emission from H II regions, and upper limits near 4000 K can be set on the electron temperatures of some of the emitting regions. The velocity components of the recombination lines may be caused by ordered flows of ionized gas surrounding individual O-stars and interacting with the molecular clouds known to be associated with W33.
Bieging John H.
Pankonin Vernon
Smith Lisa F.
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