Molecular line opacity of LiCl in the mid-infrared spectra of brown dwarfs

Abstract

We present a complete line list for the X 1Sigma+ electronic ground state of LiCl computed using fully quantum-mechanical techniques. This list includes transition energies and oscillator strengths in the spectral region 0.3-39,640.7 cm-1 for all allowed rovibrational transitions in absorption within the electronic ground state. The calculations were performed using an accurate hybrid potential constructed from a spectral inversion fit of experimental data and from recent multi-reference single- and double-excitation configuration interaction calculations. The line list was incorporated into the stellar atmosphere code PHOENIX to compute spectra for a range of young to old T dwarf models. The possibility of observing a signature of LiCl in absorption near 15.8 microns is addressed and the proposal to use this feature to estimate the total lithium elemental abundance for these cool objects is discussed.

8 pages, 2 figures, 1 table. Accepted for publication in ApJ 613, Sept. 20 2004

References in corpus (8)

• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• The Near-Infrared and Optical Spectra of Methane Dwarfs and Brown Dwarfs
• Line Intensities and Molecular Opacities of the FeH $F^4{\Delta }_i-X^4{\Delta }_i$ Transition
• New CrH Opacities for the Study of L and Brown Dwarf Atmospheres
• Spherically symmetric model atmospheres for low mass pre-Main Sequence stars with effective temperatures between 2000 and 6800 K
• The Lithium Depletion Boundary and the Age of the Young Open Cluster IC~2391
• The Molecular Line Opacity of MgH in Cool Stellar Atmospheres
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