A survey of radio recombination lines from H I regions and associated H II regions

Details A survey of radio recombination lines from H I regions and associated H II regions A survey of radio recombination lines from H I regions and associated H II regions

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..335p&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 2, Jan. 1977, p. 335-344.

Astronomy and Astrophysics

Astrophysics

45

H I Regions, H Ii Regions, H Lines, Radiative Recombination, Radio Spectra, Abundance, Carbon, Helium, Hydrogen Atoms, Hydrogen Ions, Radial Velocity, Spectral Line Width, Ultrahigh Frequencies

Scientific paper

Recombination-line spectra of fifteen H II regions were observed at 1.4 GHz, 1.6 GHz, or both, for emission from a partially ionized medium which may be associated with the H II region. Carbon lines were detected toward six of the fifteen H II regions: W 33, M 17, W 40, W 48, W 49A, DR 21. Hydrogen recombination-line spectra of DR 21, which cover the frequency range from 1.42 to 8.6 GHz, display unusual line-width and radial-velocity characteristics which can be explained by a two-component model of the H II region(s). The apparently low helium abundance in DR 21 probably results from geometric properties inherent to the structure of the H II region.

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