Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..331w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 331-336.
Astronomy and Astrophysics
Astrophysics
2
Early Stars, H Ii Regions, Hydrogen Clouds, Quantum Numbers, Astronomical Models, Atomic Energy Levels, Atomic Recombination, Electron Density (Concentration), Electron Transitions, Temperature Distribution
Scientific paper
An empirical study of high lying level populations of atomic hydrogen, based on measurements of Delta-n = 1 transitions from the principal quantum numbers n = 90, 65 and 41 has been carried out for the H II region NGC 2024. A model for the electron density and temperature distributions of this source is presented. For the central 1.8 arcsec (FWHP) part of the source, the average value of the electron temperature is 7400 K + or - 500 K. The departure coefficients from the 'standard' theory (Brocklehurst 1970) fit better than the departure coefficients of Hoang-Binh (1983). The latter include a direct interaction between the populations and photons from the ionizing star of the high n levels (Lyman pumping). Reasons for the non-detection of Lyman pumping effects is NGC 2024 are discussed.
Filges L.
Hoang-Binh D.
Stark Alexander
Wilson Thomas L.
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