L dwarfs in the Hyades
Emma HoganDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHR. F. JamesonDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHS. L. CasewellDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHS. L. OsbourneDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHN. C. HamblyScottish Universities' Physics Alliance (SUPA), Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ
2008en
ABI
Аннотация
We present the results of a proper motion survey of the Hyades to search for brown dwarfs, based on UKIRT Deep Sky Survey (UKIDSS) and Two-Micron All Sky Survey (2MASS) data. This survey covers ∼275 deg2 to a depth of K∼ 15 mag, equivalent to a mass of ∼0.05 M⊙ assuming a cluster age of 625 Myr. The discovery of 12 L dwarf Hyades members is reported. These members are also brown dwarfs, with masses between 0.05 < M < 0.075 M⊙. A high proportion of these L dwarfs appear to be photometric binaries.
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