A near-infrared search for brown dwarfs in the Pleiades

Astronomy and Astrophysics – Astronomy

Scientific paper

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Brown Dwarf Stars, Infrared Stars, Near Infrared Radiation, Open Clusters, Pleiades Cluster, Astronomical Photometry, Infrared Astronomy, Infrared Imagery, Stellar Mass

Scientific paper

Deep mosaic imaging of 200 arcmin-squared of the Pleiades was conducted at wavelengths of 0.9 micron (I band) and 2.2-micron (K band) in an effort to find free-floating low-mass cluster members. Control fields outside of the cluster, totalling 75 arcmin-squared, were also imaged to check the overall significance of the results. Photometry of all detected point sources led to the detection of 22 +/- 10 objects, when compared to the control data set, that lie near the lower Pleiades main sequence. These objects have theoretical masses in the range of about 0.1-0.04 solar mass, and are described by a power-law mass distribution with a slope of -2.8 +/- 0.5. If the detected objects are true cluster members, their combined mass would contribute significantly to that of the Pleiades.

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