Alkali line shapes for the spectra of brown dwarfs

Peach, G., Gibson, S.J., Mullamphy, D.F.T., Venturi, V., and Whittingham, I.B. (2006) Alkali line shapes for the spectra of brown dwarfs. In: Proceedings of 18th International Conference on Spectral Line Shapes (874), pp. 322-328. From: 18th International Conference on Spectral Line Shapes, 4 - 9 June 2006, Auburn, Alabama, USA.

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Abstract

Highly accurate calculations of the central cores of pressure broadened alkali resonance doublets due to H2 and He perturbers are needed in order to estimate the effects of dust in brown dwarf atmospheres. We report results for the Lorentzian profiles of the Na I and K I doublets broadened by helium perturbers for temperatures up to 3000 K. They have been obtained from a fully quantum-mechanical close-coupling description of the colliding atoms, the Baranger theory of line shapes and new ab initio potentials for the alkali-rare gas interaction.

Item ID: 9437
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: brown dwarfs: alkali resonance doublets; brown dwarfs: synthetic spectra; spectral
ISBN: 978-0-7354-0370-3
ISSN: 1551-7616
Date Deposited: 25 May 2010 01:15
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 80%
02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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