AAS 206th Meeting, 29 May - 2 June 2005
Session 32 Highlights in Laboratory Astrophysics
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[32.05] Absorption Profiles of Li and Na in Brown Dwarf Spectra

J.F. Kielkopf (U. Louisville), N.F. Allard (Institut d'Astrophysique de Paris, France), F. Allard (CRAL-ENS, Lyon, France)

An accurate determination of the complete profile including the extreme far wing is required to model the contribution of strong alkali resonance lines to brown dwarf spectra. A unified theory of collisional line profiles has been applied for the evaluation of the absorption coefficients of alkalis perturbed by helium and molecular hydrogen. Over a limited range of density and temperature, laboratory measurements can explore conditions that are similar to those in cool brown dwarf atmospheres, and can be used to validate the potentials which support the spectral line profile theory. Results are reported here for a study of the far wings of Li and Na.

The author(s) of this abstract have provided an email address for comments about the abstract: kielkopf@louisville.edu

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© 2005. The American Astronomical Soceity.