Open AccessTime‐resolved spectroscopy of the variable brown dwarf Kelu‐1 ★
Author(s) -
Clarke F. J.,
Tinney C. G.,
Hodgkin S. T.
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06405.x
Subject(s) - physics , brown dwarf , photometry (optics) , astrophysics , spectroscopy , spectral line , astronomy , rotation period , stars
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.