Measurements of the He-3 abundance in the interstellar medium
1987; IOP Publishing; Volume: 323; Linguagem: Inglês
10.1086/165805
ISSN1538-4357
AutoresT. M. Bania, Robert T. Rood, T. L. Wilson,
Tópico(s)Astrophysics and Star Formation Studies
Resumoview Abstract Citations (52) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurements of the 3He Abundance in the Interstellar Medium Bania, T. M. ; Rood, Robert T. ; Wilson, T. L. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1987 DOI: 10.1086/165805 Bibcode: 1987ApJ...323...30B Keywords: Abundance; Astronomical Spectroscopy; Helium Isotopes; Hyperfine Structure; Interstellar Gas; Line Spectra; Emission Spectra; Milky Way Galaxy; Nebulae; Nuclear Fusion; Radio Spectra; Astrophysics; COSMOLOGY; NEBULAE: ABUNDANCES; NEBULAE: H II REGIONS; NUCLEOSYNTHESIS; RADIO SOURCES: LINES full text sources ADS | data products SIMBAD (21) NED (2)
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