Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.329..543d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 329, Issue 3, pp. 543-555.
Astronomy and Astrophysics
Astronomy
19
Techniques: Photometric, Surveys, Stars: Low-Mass, Brown Dwarfs, Open Clusters And Associations: Individual: Hyades, Infrared: Stars
Scientific paper
We present the results of a comprehensive I- and Z-band photometric survey of 10.5deg2 of the Hyades to search for low-mass stellar and substellar members. The survey, which is >~95 per cent photometrically complete to IC~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.
Dobbie Paul D.
Hambly Nigel C.
Hawkins R. S. M.
Hodgkin Simon T.
Jameson Richard F.
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