Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...87..177r&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 87, no. 1, Jan. 1991, p. 177-214. ASTRON-supported research.
Astronomy and Astrophysics
Astronomy
37
Galactic Clusters, H Ii Regions, H Lines, Hydrogen Recombinations, Infrared Sources (Astronomy), Radio Sources (Astronomy), Line Spectra, Radio Emission, Stellar Composition, Vibrational Spectra
Scientific paper
This paper presents the results of multifrequency high resolution observations of the giant H II complex in the hydrogen, helium, and carbon 76-alpha, 110-alpha, 166-alpha, and 272-alpha radio recombination lines. Locally strong helium lines are observed toward W3A and B in which the He to H line intensity ratio is found to be greater than 20 percent or more. Possible explanations for these high line ratios are local He enrichment of the ISM due to an evolved stellar object or the presence of a very hard radiation field leading to underionization of hydrogen. Carbon emission is detected toward the core region of W3. No carbon emission is observed at locations away from the strong continuum sources, which must be due to the C II cloud being located in front of these sources. Stimulated emission is the main emission mechanism for the C166-alpha and C110-alpha lines observed toward W3A.
Goss William Miller
Roelfsema Peter R.
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