Hunting brown dwarfs and low mass stars in NGC 2547

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Scientific paper

The Pleiades (age 115 Myr) is the only place in our Galaxy for which a reliable mass function (MF) has been estimated for very low mass stars and brown dwarfs (BDs). The results suggest that BDs do not make a significant contribution to local dark matter or Galactic dynamics. However, because mass segregation and evaporation have been at work in the relaxed Pleiades cluster, it is important to test whether the derived MF is universal and representative of the Initial MF. We propose deep RIZ observations of NGC 2547, an open cluster that resembles the Pleiades in size and richness but is much younger (age 15 Myr), and cannot have experienced significant mass segregation or energy equipartition. We will use the photometry to identify BD candidates and investigate their spatial distribution. The BDs of NGC 2547 will be hotter and more luminous than those in the older Pleiades and because the cluster is further away and has a small angular extent, we can easily obtain a survey that is more complete than any work done so far on the Pleiades. If NGC 2547 and the Pleiades share a common MF, we will detect about 200 BDs.

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