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L and T dwarfs in the Hyades and Ursa Major moving groups

By N. P. Bannister and R. F. Jameson


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

Topics: stars: kinematics, stars: low-mass, brown dwarfs, open clusters and associations: individual: Ursa Major, open clusters and associations: individual: Hyades, galaxies: star clusters
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Year: 2007
DOI identifier: 10.1111/j.1745-3933.2007.00312.x
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