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Lithium in Brown Dwarfs

Published online by Cambridge University Press:  25 May 2016

Rafael Rebolo
Rafael Rebolo*
Affiliation:
Instituto de Astrofísica de Canarias and Consejo Superior de Investigaciones Científicas E-38200 La Laguna, Tenerife, Spain

Abstract

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Lithium is a key element to establish the substellar nature of brown dwarf candidates. Theoretical calculations show that brown dwarfs with masses below ˜ 0.065 M⊙ preserve a significant fraction of their initial Li content while for higher masses total Li depletion occurs in short timescales. Lithium is preserved at masses well below the hydrogen burning mass. Strong lithium lines have been predicted and discovered in the spectra of brown dwarfs. Most of the bona fide brown dwarfs detected in stellar clusters and in the solar neighborhood have been confirmed to be substellar via detection of the lithium resonance doublet at 670.8 nm. I review these detections and the progress made in understanding the formation of Li lines in very cool high gravity dwarfs.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 299 - 309
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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