The 'helium problem' in the source DR 21

Details The 'helium problem' in the source DR 21 The 'helium problem' in the source DR 21

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..374p&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 374, 375.

Astronomy and Astrophysics

Astronomy

Abundance, Helium Ions, Hydrogen Clouds, Hydrogen Ions, Line Spectra, Radio Sources (Astronomy), H Lines, Stark Effect

Scientific paper

An attempt is made to interpret radio recombination line observations of
the source DR 21. The effect of pressure broadening on the He(+)/H(+)
ratio is determined, and it is shown that this ratio greatly contributes
to the failure to detect the He 109-alpha line.

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