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Multicolour time series photometry of three periodic ultracool dwarfs
(Oxford University Press, 2013)
Photometry in I, or contemporaneously in I and R, of the known variable ultracool dwarfs Kelu-1 and 2MASS J11553952−3727350 is presented. The nature of the variability of Kelu-1 appears to evolve on time-scales of a day ...