Commission 45: Spectral Classification

Details Commission 45: Spectral Classification Commission 45: Spectral Classification

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012iautb..28..190g&link_type=abstract

Transactions IAU, Volume 7, Issue T28, p. 190-195

Astronomy and Astrophysics

Astrophysics

Scientific paper

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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