Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323...30b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 30-43. Research supported by Boston University and Re
Other
45
Abundance, Astronomical Spectroscopy, Helium Isotopes, Hyperfine Structure, Interstellar Gas, Line Spectra, Emission Spectra, Milky Way Galaxy, Nebulae, Nuclear Fusion, Radio Spectra
Scientific paper
An extensive search for emission from the 8.7 GHz hyperfine line of 3He+ in 17 Galactic H II regions has yielded new detections in six regions and significant upper limits for the others. The authors derive the (3He/H) abundance ratios for their sources and find the largest (3He/H) abundance ratio is more than 10 times greater than their smallest limit. This observation gives strong support for source-to-source variations. There is a marginal tendency for sources outside the solar circle to have larger abundances. For the nine sources where 3He+ was detected, the average (3He/H) abundance ranges from 1.2 to 14.7×10-5 by number; for sources with limits, the lowest values are about 1×10-5. The authors discuss briefly the utility of 3He+ as a probe of cosmology or the chemical evolution of the Milky Way.
Bania Thomas M.
Rood Robert T.
Wilson Thomas L.
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