AL II emission-line strengths in low-density astrophysical plasmas

Details AL II emission-line strengths in low-density astrophysical plasmas AL II emission-line strengths in low-density astrophysical plasmas

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..375k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 375-377. Research supported by SERC and Department o

Astronomy and Astrophysics

Astrophysics

9

Aluminum, Atomic Excitations, Cosmic Plasma, Electron Density (Concentration), Emission Spectra, Plasma Diagnostics, Rarefied Plasmas, Electron Impact, Metal Ions, Planetary Nebulae, Symbiotic Stars, Transition Probabilities

Scientific paper

Theoretical values of the emission-line ratio R are derived for the transitions 3s2 1S-3s3p 3P2 and 3s2 1S-3s3p 3P1 in Al II, at 2660 and 2669 A, respectively. These ratios are compared with IUE observations of the planetary nebula NGC 7027 and the symbiotic star RR Tel, to illustrate the usefulness of the R as an electron density diagnostics. A value of R = 0.72 was deduced for NGC 7027, which implies log Ne = 4.2 for Te = 14,000 K. This is consistent with densities deduced earlier for this planetary nebula.

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