Titlebook: Ultracool Dwarfs; New Spectral Types L Hugh R. A. Jones,Iain A. Steele Conference proceedings 2001 Springer-Verlag Berlin Heidelberg 2001 B

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The Classification of L Dwarfse reasoning behind the choice of letters “L” and “T” is also given. Our philosophy of spectral classification is explained and we use this philosophy to construct an L dwarf typing scheme. The scheme, originally developed on only 25 spectra, has now been shown to work successfully on a sample of 92 L dwarfs.

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Introduction: Theoretical Models of Brown Dwarfs — an Observer’s PerspectiveThe three papers presented in this section on model atmospheres of brown dwarfs raise several common themes. I discuss three of these from an observational viewpoint — the temperature scale for L dwarfs, the role of the alkali elements, and the liely “weather” in brown dwarf atmospheres.

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The Second Guide Star Catalogue and Cool StarsWe discuss how the Second Guide Star Catalogue, GSC-II, will use cool stars to constrain the faint end of the luminosity function, the white dwarf contribution to dark matter in the halo and the nearby stellar population. We also assess the potential of GSC-II for research on the new ultracool L and T dwarfs.

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Introduction: The Spectral Types of the Ultracool DwarfsThe proposed L and T spectral classes to classify Ultra-Cool Dwarfs are well defined and extend the K and M sequence of the MK system to lower temperatures. They can be understood as a single temperature sequence by including dust condensation and segregation in addition to ionization and dissociation that underlies the MK system.

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