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COMMISSION 45: SPECTRAL CLASSIFICATION
Published online by Cambridge University Press: 04 April 2012
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.
- Type
- Contributed Papers
- Information
- Proceedings of the International Astronomical Union , Volume 7 , Transactions T28A: Transactions IAU , December 2011 , pp. 190 - 195
- Copyright
- Copyright © International Astronomical Union 2012