On the interpretation of the 137 beta/109 alpha ratio

Details On the interpretation of the 137 beta/109 alpha ratio On the interpretation of the 137 beta/109 alpha ratio

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..312s&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 3, Nov. 1979, p. 312-314.

Astronomy and Astrophysics

Astrophysics

9

Pressure Broadening, Radiative Recombination, Radio Spectra, H Ii Regions, Line Spectra

Scientific paper

The H 137 beta/H 109 alpha intensity ratio, which in thermodynamic equilibrium (LTE) should be 0.276, appears to be 20-30% below this value for several H II regions of high electron density and emission measure; this difference amounts to 1020 standard deviations in recent high-precision measurements by Churchwell et al. (1978). In determining the relative electron temperature values, allowance is made for the subtraction of broad Voight wings in the baseline removal process and for the possible presence of several components with different densities. Consequently, pressure broadening plays a dominant role in producing the apparently low intensity ratios, while stimulated emission is far less important than those ratios imply.

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