We have used the moving cluster method to identify three L dwarfs and one T dwarf in the Ursa Major/Sirius moving group (age 400 Myr). Five L dwarfs and two T dwarfs are found to belong to the Hyades moving group (age 625 Myr). These L and T dwarfs define 400- and 625- Myr empirical isochrones, assuming that they have the same age. Moving group membership does not guarantee coevality.
@article{arxiv.0705.1088,
title = {L and T dwarfs in the Hyades and Ursa Major moving groups},
author = {N. P. Bannister and R. F. Jameson},
journal= {arXiv preprint arXiv:0705.1088},
year = {2009}
}