Search for the least massive objects in the Hyades open cluster with the help of a wide stellar view

We present a photometric survey and a survey of proper motions covering an area of 23.4 deg 2 in the core of the open cluster Hyades. Searches have been made for new low-mass stars and brown dwarf candidates in the Hyades in order to improve the current mass function of the cluster down to sub-stellar masses. Using color-magnitude diagrams in the optical and infrared ranges, we have identified 66 photometric candidates for cluster members in the range 14.7 m < I < 20.5 m . These results indicate that the mass function of the Hyades becomes poor for objects with masses below 0.15M indicating that the Hyades probably lost the objects with the lowest mass as a result of dynamic evolution. We concluded that the Hyades core represents the so-called "desert" for the low-mass stars and brown dwarf and that most of the sub-stellar objects have already left this cluster.

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