Observationally determined silicon II oscillator strengths

Details Observationally determined silicon II oscillator strengths Observationally determined silicon II oscillator strengths

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..549s&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 549-553.

Astronomy and Astrophysics

Astronomy

78

Astronomical Spectroscopy, Atomic Spectra, Interstellar Matter, Resonance Lines, Silicon, Abundance, Line Spectra, Oscillators, Resonant Frequencies, Spaceborne Astronomy, Transition Probabilities, Ultraviolet Astronomy

Scientific paper

Si II oscillator strengths for eight resonance lines from the ground state have been determined using a curve-of-growth analysis of interstellar data from the Copernicus and International Ultraviolet Explorer satellites. The oscillator strengths for 1526 A and 1808 A increase by factors of 3.0 and 1.5, respectively, from previously tabulated values; those for 989 A and 1020 A decrease by factors of 0.55 and 0.60, respectively. These new values result in better silicon abundances for interstellar clouds and resolve a long-standing puzzle in the interpretation of quasar absorption line data.

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