Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209p...1d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, July 1, 1984, p. 1P-4P. Research supported by the
Astronomy and Astrophysics
Astronomy
15
Cosmic Plasma, Emission Spectra, Plasma Spectra, Rarefied Plasmas, Silicon, Ultraviolet Astronomy, Collision Parameters, Planetary Nebulae, Plasma Density, Plasma Diagnostics, Spectral Line Width
Scientific paper
Theoretical emissivity ratios appropriate to homogeneous optically thin
plasmas are presented for the Si III lines at 1883 and 1892 Å.
These lines are a useful density diagnostic for Ne ≥
104cm-3, their use being illustrated for the
planetary nebulae NGC 7662 and V1016 Cygni.
Dufton Philip L.
Keenan Francis P.
Kingston A. E.
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