Activity and Kinematics of M and L Dwarfs
Astrophysics
2007-05-23 v1
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.
Cite
@article{arxiv.astro-ph/0010528,
title = {Activity and Kinematics of M and L Dwarfs},
author = {John E. Gizis},
journal= {arXiv preprint arXiv:astro-ph/0010528},
year = {2007}
}
Comments
to appear in proceedings of Ultracool Dwarf Stars: Surveys, Properties and Spectral Classification (Lecture Notes in Physics), eds. Jones and Steele. 12 pages