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

Journal article

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 a time-scale of 1-24 h. We do, however, report periodic variability in the pseudo-equivalent width of Hα consistent with the 1.8-h rotation period previously reported for this object. Near-contemporaneous I-band photometry shows evidence for non-periodic variability at the level of 2 per cent.

Authors: Clarke, F; Tinney, C; Hodgkin, S

• Publication status: Published
• Journal: Monthly Notices of the Royal Astronomical Society
• Volume: 341
• Issue: 1
• Pages: 239-246
• Publication date: 2003-05-01
• DOI: 10.1046/j.1365-8711.2003.06405.x
• EISSN: 1365-2966
• ISSN: 0035-8711
• Language: English
• Keywords: techniques : spectroscopic; stars : individual : Kelu-1; techniques : photometric; stars : low-mass, brown dwarfs