4.7 Article

L and t dwarfs in the hyades and ursa major moving groups

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 378, Issue 1, Pages L24-L28

Publisher

OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2007.00312.x

Keywords

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

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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.

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