Stark broadening of visible SI II lines in stellar atmospheres

Details Stark broadening of visible SI II lines in stellar atmospheres Stark broadening of visible SI II lines in stellar atmospheres

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..249l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 249-254. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

77

Absorption Spectra, Abundance, Silicon, Stark Effect, Stellar Atmospheres, Stellar Spectra, Visible Spectrum, A Stars, B Stars, Electron Transitions, Fine Structure, Line Spectra, Peculiar Stars, Spectral Line Width

Scientific paper

The Stark broadening of visible Si II lines is studied and its consequence on the intensity of the stellar absorption is analyzed. A complete set of atomic data concerning the Stark widths, is elaborated for 19 multiplets of Si II of astrophysical importance. Previous available determinations are reviewed and new Stark widths are calculated by means of the semi-classical impact theory. The accuracy of different theoretical and empirical methods are discussed. The new adopted Stark widths are applied, in several examples, to the analysis of stellar absorption lines. These widths are generally smaller than the previous theoretical estimates for the low-excitation transitions of Si II.

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