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Periodic Variability of the Brown Dwarf Kelu-1

Published online by Cambridge University Press:  26 May 2016

F. J. Clarke ,
C. G. Tinney  and
S. T. Hodgkin
F. J. Clarke
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge, CB3 OHA, UK
C. G. Tinney
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Aus
S. T. Hodgkin
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge, CB3 OHA, UK

Abstract

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We present results of two observing campaigns aimed at characterising variability of the L2 brown dwarf Kelu-1. The first campaign in March 2000 detected photometric variability at the 1.2% level, with a strong period of 1.8 hours. Followup spectroscopic observations with the VLT in February 2002 show no evidence of significant variability in the dust sensitive molecular lines, but do show evidence for variability in the EW(Hα) with a period of 1.8 hours. Radial velocity measurements rule out a close substellar companion. Kelu-1 appears to be a single brown dwarf with a rotation period of 1.8 hours.

Type
Part 8. Activity and Weather
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 457 - 458
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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