The Spectra and Classification of L and T Dwarfs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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10 pages, 6 figures, To be published in Proceedings of the 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun

Scientific paper

In this contribution, I discuss some of the salient features of L and T dwarf spectra in both the red optical (6300--10000 {\AA}) and near-infrared (1--2.5 $\micron$) wavelength regimes. Important absorption bands and lines, including those of H$_2$O, CH$_4$, FeH, CrH, CO, and the alkali metal lines, are identified, and the development of recent classification schemes based on these features are discussed. I briefly point out future work required in these wavelength regions and in the mid-infrared that are required to garner a complete picture of these low-luminosity dwarfs.

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