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Keywords:

  • stars: kinematics;
  • stars: low-mass, brown dwarfs;
  • open clusters and associations: individual: Ursa Major;
  • open clusters and associations: individual: Hyades;
  • galaxies: star clusters

ABSTRACT

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.