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Title:
The ages of L dwarfs
Authors:
Jameson, R. F.; Lodieu, N.; Casewell, S. L.; Bannister, N. P.; Dobbie, P. D.
Affiliation:
AA(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH), AB(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH; Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain), AC(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH), AD(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH), AE(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH; Anglo-Australian Observatory, PO Box 296, Epping 1710, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 4, pp. 1771-1778. (MNRAS Homepage)
Publication Date:
04/2008
Origin:
MNRAS
MNRAS Keywords:
stars: low-mass, brown dwarfs , open clusters and associations: general
Abstract Copyright:
(c) ©Journal compilation © 2008 RAS
DOI:
10.1111/j.1365-2966.2008.12973.x
Bibliographic Code:
2008MNRAS.385.1771J

Abstract

We present a new method to derive the age of young (<0.7 Gyr) L dwarfs based on their near-infrared photometry, colours and distances. The method is based on samples of L dwarfs belonging to the Upper Sco association (5 Myr), the Alpha Per (85 Myr) and Pleiades (125 Myr) clusters, and the Ursa Major (400 Myr) and Hyades (625 Myr) moving groups. We apply our method to a number of interesting objects in the literature, including a known L dwarf binary, L dwarf companions and spectroscopic members of the young σ Orionis cluster.

Based on observations made with the United Kingdom Infrared Telescope, operated by the Joint Astronomy Centre on behalf of the UK Particle Physics and Astronomy Research Council.

E-mail: rfj@star.le.ac.uk

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