Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..719q&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Nov. 1983, p. 719-732.
Astronomy and Astrophysics
Astronomy
8
Abundance, Carbon, Hydrogen Clouds, Line Spectra, Radiative Recombination, Radio Astronomy, Electron Density (Concentration), H Lines, Temperature Measurement
Scientific paper
A detailed study of the line intensities of C and other anomalous recombination lines from NGC 2024, Orion A and W3 is reported. Position-dependent electron densities and temperatures are calculated from chemical, ionization and thermal equilibria using a self-consistent method. The statistical equilibrium is also solved for the electron density and temperature corresponding to each position in order to calculate the departure coefficients from thermodynamic equilibrium. The best fit of the observed recombination-line intensities over the frequency spectrum (0.6-15 GHz) is used to derive the physical parameters of each cloud on the assumption of both solar and depleted abundances. It is found that the hydrogen densities lie in the ranges 2 x 10 to the 4th to 4 x 10 to the 5th/cu cm for solar and 5 x 10 to the 4th to 2 x 10 to the 6th/cu cm for depleted abundances. The temperature variations for a typical value of hydrogen density nH = 10 to the 5th/cu cm are 150 to 30 K and 300 to 25 K for solar and depleted abundances respectively.
Qaiyum Abdul
Razaullah Ansari S. M.
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