The helium abundance of galactic H II regions

Details The helium abundance of galactic H II regions The helium abundance of galactic H II regions

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..269t&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 3, July 1980, p. 269-275.

Astronomy and Astrophysics

Astronomy

46

Abundance, Galactic Radiation, H Ii Regions, Helium, Hydrogen Recombinations, Radio Astronomy, Angular Resolution, Electron Energy, Galactic Structure, High Resolution, Ionized Gases, Line Spectra, Spectral Line Width

Scientific paper

Hydrogen and helium recombination lines have been observed at 15 and 22 GHz from 13 galactic H II regions. These data support earlier evidence for a decrease in the total helium abundance from 7 to 15 kpc galactic radius and an increase in the electron temperature of H II regions from 5 to 15 kpc. The present high angular resolution data show that the low values of the ionized helium abundance observed earlier for some H II regions are due to the presence of neutral helium in the H II regions. Inside 7 kpc this neutral fraction confuses the evaluation of the total helium abundances.

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