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

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

2004-06-07

arxiv.org/abs/astro-ph/0406147v1

Astrophys.J. 613 (2004) 567-571

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/423029

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.

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