Recombination lines /76 alpha/ of hydrogen, helium, carbon and one other element from high-emission-measure H II regions

Details Recombination lines /76 alpha/ of hydrogen, helium, carbon and one other element from high-emission-measure H II regions Recombination lines /76 alpha/ of hydrogen, helium, carbon and one other element from high-emission-measure H II regions

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..889m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 889-905.

Astronomy and Astrophysics

Astronomy

56

Atomic Recombination, Carbon, Emission Spectra, H Ii Regions, Helium, Hydrogen Recombinations, Radio Astronomy, Spectral Line Width, Abundance, Electron Energy, Galactic Nuclei, H Alpha Line, Radial Velocity

Scientific paper

Twenty-five H II regions of relatively high emission measure have been observed with a telescope beam of half-power width, 2.3 arcmin, near 14.7 GHz for their radio recombination lines of hydrogen, helium, carbon, and other elements. Sources and their observed continuum parameters are presented. Electron temperatures, and the helium abundance ratios and their distribution with the galactic radius were discussed; no correlation was found between the He(+) abundance and the galactic radius. Carbon recombination lines were detected in 20 sources, and their radial velocities and those of the hydrogen lines are compared with the velocities of several molecular species observed in the directions of the same sources. It is concluded that a definite gradient exists in the relation between the electron temperature and the distance of the nebulae from the Galactic Center.

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