Time resolved spectroscopy of the variable brown dwarf Kelu-1

Astrophysics, abstract
astro-ph/0301155

From: Fraser Clarke <[email protected]>

Date: Thu, 9 Jan 2003 19:25:19 GMT   (292kb)

Authors:
F.J. Clarke (ESO/Chile, IoA Cambridge),
C.G. Tinney (AAO),
S.T. Hodgkin (IoA Cambridge)

Comments: 9 pages, 12 figures. MNRAS in press

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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