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COMMISSION 45: SPECTRAL CLASSIFICATION

  • Richard O. Gray, Birgitta Nordström, Sunetra Giridhar, Adam J. Burgasser, Laurent Eyer, Ranjan Gupta, Margaret M. Hanson, Michael J. Irwin and Caroline Soubiran...

Extract

This report gives an update on developments since the last General Assembly in Rio de Janeiro. Classification – both photometric and spectral – continues to play a vital role in stellar astrophysics and stellar surveys. During the past three years, rapid progress has been made in the classification of brown dwarfs, with the discovery of the first Y dwarfs and the introduction of a near-IR classification system for M- and L-dwarfs. The number of known L-dwarfs now exceeds 1000, and so peculiar types are beginning to show up. For instance, there is now enough material to define a low-gravity spectral sequence for the L0 – L5 dwarfs. In addition, a number of unusally blue L-dwarfs are now known. Large-area surveys, always of interest to Commission 45, have proliferated during this period, including RAVE, SEGUE, and WISE with many more in the planning stages.

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