Primordial helium abundance determinations using galactic H II regions

Details Primordial helium abundance determinations using galactic H II regions Primordial helium abundance determinations using galactic H II regions

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work..299s&link_type=abstract

IN: ESO Workshop on Primordial Helium, Garching, West Germany, February 2, 3, 1983, Proceedings (A83-50030 24-90). Garching, Wes

Physics

2

Abundance, Galactic Evolution, H Ii Regions, Helium Ions, Interstellar Gas, Milky Way Galaxy, Galactic Nuclei, Heavy Elements, Hydrogen Ions

Scientific paper

The existing data base on the total He abundance and the ionized He/ionized H rations (He+/H+) for galactic H II regions is discussed.Typical ratios are only accurate to 20 percent, with the abundance generally being about 11.3 percent, a figure that may be too high in low-excitation H II regions. Measurements of the abundance gradient across a galactic disk indicate that the He+/H+ ratio changes within 7 kpc of galactic centers, where metallicity could increase. It is concluded that the galactic H II regions may not be suitable for determining the primordial He abundance, based on currently available data and theoretical modelling.

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