Little is known about the population of the Coma Berenices open cluster (age~500Myr) below 0.2M_{sun}, and statistics show that there is a prominent deficit of very low-mass objects in this mass range compared to younger open clusters with ages of <250Myr. We search for very low-mass stars and substellar objects (brown dwarfs) in the Coma open cluster to derive the present-day cluster mass function below 0.2M{sun}_.
Cone search capability for table J/A+A/544/A111/tableb1 (RI and 2MASS JHKs photometry of Coma open cluster member candidates)