Time resolved spectroscopy of the variable brown dwarf Kelu-1

Details Time resolved spectroscopy of the variable brown dwarf Kelu-1 Time resolved spectroscopy of the variable brown dwarf Kelu-1

2003-01-09

arxiv.org/abs/astro-ph/0301155v1

Mon.Not.Roy.Astron.Soc.341:239,2003

Astronomy and Astrophysics

Astrophysics

9 pages, 12 figures. MNRAS in press

Scientific paper

10.1046/j.1365-8711.2003.06405.x

We report the results of observations designed to investigate the spectroscopic signatures of dust clouds on the L2 brown dwarf Kelu-1. Time resolved medium resolution spectra show no significant evidence of variability in the dust sensitive TiO, CrH and FeH bandheads on the timescale of 1--24 hours. We do however report periodic variability in the psuedo-equivelent width of H-alpha consistent with the 1.8 hour rotation period previously reported for this object Clarke, Tinney & Tolley (2002). Near-contemporaneous I-band photometry shows evidence for non-periodic variability at the level of 2%.

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