Helium in the center of the galaxy

Details Helium in the center of the galaxy Helium in the center of the galaxy

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47..143m&link_type=abstract

Astronomy and Astrophysics, vol. 47, no. 1, Feb. 1976, p. 143-151.

Astronomy and Astrophysics

Astrophysics

26

Abundance, Galactic Nuclei, Helium, Astronomical Spectroscopy, H Ii Regions, Helium Ions, Hydrogen Ions, Line Spectra, Radiative Recombination

Scientific paper

This paper reports the detection of the He 109-alpha lines in the two giant H II regions G 0.5-0.1 and G 0.7-0.0 and also confirms the detection of the same lines in the compact H II region Sgr A West, which surrounds the nucleus of the Galaxy. The source parameters are derived from both recombination-line and continuum observations. The He II abundances of the two giant regions are estimated to be much lower than normal, the abundance in Sgr A West is estimated to be nearly normal, and it is concluded that the total neutral helium abundance in the galactic center is at least normal, although an overabundance in Sgr A West is possible. The question is considered of why the observed He II abundances in the giant H II regions near the galactic center are so much lower than those in the giant H II regions of the spiral arms.

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