3He in the Milky Way Interstellar Medium: Summary of Relevant Observations

Details 3He in the Milky Way Interstellar Medium: Summary of Relevant Observations 3He in the Milky Way Interstellar Medium: Summary of Relevant Observations

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apjs..113..353b&link_type=abstract

Astrophysical Journal Supplement v.113, p.353

Astronomy and Astrophysics

Astronomy

33

Ism: H Ii Regions, Ism: Abundances, Nuclear Reactions, Nucleosynthesis, Abundances, Radio Lines: Ism

Scientific paper

We summarize spectral line and continuum observations of a sample of 21 Galactic H II regions made at 3.46 cm wavelength during the past 14 years as part of a program to measure the abundance of 3He in the Milky Way interstellar medium. Converting the observed 3He+ column density into an abundance ratio relative to hydrogen depends on the density and ionization structure of each nebula. The observations needed to model our sources were made with the NRAO 140 foot (43 m), NRAO VLA, and MPIfR 100 m telescopes. Here we describe and compile our measurements of the 3He+ emission line as well as those of various recombination transitions of H, He, and C. We also summarize the continuum database which includes single-dish observations and interferometer maps.

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