Helium in southern H II regions

Details Helium in southern H II regions Helium in southern H II regions

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193...69d&link_type=abstract

Astrophysical Journal, vol. 193, Oct. 1, 1974, pt. 1, p. 69-71.

Physics

Optics

8

Abundance, Astronomical Spectroscopy, Emission Spectra, H Ii Regions, Helium, Balmer Series, Cassegrain Optics, Electron Density (Concentration), H Lines, Nebulae, Radio Spectra, Southern Hemisphere, Temperature Measurement

Scientific paper

Optical and radio observations of the helium abundances in the southern H II regions NGC 3576, RCW 38, and NGC 6357 are discussed. A discrepancy between optical and radio-recombination-line values for N(He+)/N(H+) in the case of NGC 6357 is attributed to the dissimilar observing techniques. One possibility is that the radio observations with bandwidths of about 6 prime are integrating over regions which include much neutral helium, while the optical observations encompass regions of high surface brightness in H beta. Systematic calibration error appears ruled out by the good agreement in the case of NGC 3576.-

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