Recent Work on Line Shapes for the Spectra of Cool Stars

Details Recent Work on Line Shapes for the Spectra of Cool Stars Recent Work on Line Shapes for the Spectra of Cool Stars

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..938..142p&link_type=abstract

SPECTRAL LINE SHAPES IN ASTROPHYSICS: VI Serbian Conference on Spectral Line Shapes in Astrophysics (VI SCSLSA). AIP Conference

Astronomy and Astrophysics

Astrophysics

Atomic And Molecular Data, Spectra, And Spectral Parameters, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs

Scientific paper

Accurate pressure broadened profiles of alkali resonance doublets perturbed by helium are needed for modelling of the atmospheres of late M, L and T type brown dwarfs for temperatures up to 3000 K. Previous fully quantum-mechanical calculations of line widths and shifts are extended to consider the line-wing profiles where impact theory is no longer valid. Results are presented for the Lorentzian line widths of the lithium, sodium and potassium resonance lines calculated using both impact and one-perturber theory. Excellent agreement between these two approximations is obtained, demonstrating that quantum-mechanical calculations of the line profiles can be made that are accurate over the whole range of frequencies from the line centre to the line wings.

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