Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..629r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 629-647. Research supported by Boston University.
Astronomy and Astrophysics
Astronomy
68
Abundance, H Ii Regions, Helium Ions, Hyperfine Structure, Line Spectra, Radio Sources (Astronomy), Atomic Structure, Galactic Evolution, Ion Recombination, Microwave Spectra, Milky Way Galaxy, Signal To Noise Ratios, Solar System
Scientific paper
A search for the 8.7 GHz hyperfine line of 3He+ in galactic H II regions has yielded detections in three regions and significant upper limits for three others. The authors derive 3He/H abundance ratios of 4×10-5 in W43, 1×10-4 in W51, and 5×10-4 in W3. The upper limits found are 6×10-5 in Orion A, and 2×10-5 in W49 and M17S. These abundances have been corrected (by up to a factor of 2) for source structure using simple core-halo models. For these weak lines systematic errors can be much larger than random noise, so the authors have simultaneously observed many weak recombination lines in order to estimate the magnitude of the systematic errors. The implications of these results for the general chemical evolution of the Galaxy are discussed.
Bania Thomas M.
Rood Robert T.
Wilson Thomas L.
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