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.
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| 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) | |||||||||
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| Subject Keywords: | Tangential Velocity; Spectral Type; Proper Motion; Lithium Absorption; Chromospheric Activity | |||||||||
| DOI: | 10.1007/978-3-642-56672-1_7 | |||||||||
| 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: | 16 Nov 2021 17:54 |
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