Interspecies emission-line ratios as electron density diagnostics for late-type stellar atmospheres

Details Interspecies emission-line ratios as electron density diagnostics for late-type stellar atmospheres Interspecies emission-line ratios as electron density diagnostics for late-type stellar atmospheres

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..636k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 636-639. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

3

Electron Density (Concentration), Late Stars, Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectra, Chromosphere, Electron Energy, Emission Spectra, Iue, Line Spectra

Scientific paper

Electron-impact excitation rates for transitions in S IV, Al III, and N IV, determined with the R-matrix code, are used to calculate relative level populations for electron temperatures log Te = 4.4 - 5.4 and densities Ne between 10 to the 8th and 10 to the 12th/cu cm. These data are combined with similar results for C III and O III to derive emission-line ratios which should be useful as electron-density diagnostics when applied to the UV spectra of late-type stellar atmospheres.

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