Near-infrared time-series photometry of six fields in the young open cluster IC 2391 |
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| Authors: | Chris Koen Akika Ishihara |
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| Affiliation: | Department of Statistics, University of the Western Cape, Private Bag X17, Bellville, 7535 Cape, South Africa;SAAO, PO Box 9, Observatory, 7935 Cape, South Africa;Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan |
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| Abstract: | Fields containing targets of spectral types later than M5 were monitored in JHKs for about 7 h each. None of the targets showed variability at levels exceeding 0.02 (or smaller, in some cases). Seven new variable stars were discovered serendipitously. The large number of measurements (more than 50) of each field allows the construction of accurate colour–magnitude and colour–colour diagrams. These could be used to identify a small number of candidate very cool objects. |
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| Keywords: | stars: low-mass, brown dwarfs stars: variables: other |
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