Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 329, Issue 3, Pages 543-555Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2002.05002.x
Keywords
techniques : photometric; surveys; stars : low-mass, brown dwarfs; open clusters and associations : individual : Hyades; infrared : stars
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We present the results of a comprehensive I- and Z-band photometric survey of 10.5 deg(2) of the Hyades to search for low-mass stellar and substellar members. The survey, which is greater than or similar to95 per cent photometrically complete to I-C approximate to 20.3, has unearthed a total of 20 candidates, 14 of which are previously uncatalogued. Despite follow-up observations indicating that nine display spectral energy distributions consistent with cluster membership, a detailed astrometric study of all 20 reveals that only one, the previously known stellar member RHy297, displays a proper motion typical of a Hyad. We discuss our failure to detect further low-mass members in terms of the shape of the present-day mass function of the Hyades and find that dynamical evolution has probably led to their preferential evaporation from the cluster.
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