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Activity and Kinematics of M and L Dwarfs

Gizis, J. E. (2001) Activity and Kinematics of M and L Dwarfs. In: Ultracool Dwarfs: New Spectral Types L and T. Springer , Berlin, pp. 71-82. ISBN 978-3-642-62682-1. https://resolver.caltech.edu/CaltechAUTHORS:20200108-074608612

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Abstract

I discuss observations of two traditional age indicators: chromospheric activity and kinematics, in late-M and L dwarfs near the hydrogen-burning limit. The frequency and strength of chromospheric activity disappears rapidly as a function of temperature over spectral types M8-L4. There is evidence that young late-M and L dwarfs have weaker activity than older ones (the opposite of the traditional stellar age-activity relation). The kinematics of L dwarfs confirm that lithium L dwarfs are younger than non-lithium dwarfs.


Item Type:Book Section
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URLURL TypeDescription
https://doi.org/10.1007/978-3-642-56672-1_7DOIArticle
https://rdcu.be/b3ZGAPublisherFree ReadCube access
ORCID:
AuthorORCID
Gizis, J. E.0000-0002-8916-1972
Additional Information:© 2001 Springer-Verlag Berlin Heidelberg. I would like to thank the 2MASS Rare Objects Team (Jim Liebert, Davy Kirkpatrick, Neill Reid, Dave Monet, Conard Dahn, Adam Burgasser), Mike Skrutskie, and Suzanne Hawley for many discussions of stars and brown dwarfs. I acknowledge the support of the Jet Propulsion Laboratory, California Institute of Technology, which is operated under contract with NASA. This publication makes use of data products from 2MASS, which is a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and NSF. I was a Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the NSF.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:Tangential Velocity; Spectral Type; Proper Motion; Lithium Absorption; Chromospheric Activity
Record Number:CaltechAUTHORS:20200108-074608612
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200108-074608612
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100552
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jan 2020 18:10
Last Modified:06 May 2020 22:52

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