Статья

A deep large-area search for very low-mass members of the Hyades open cluster

P. D. DobbieAstronomy Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHF. KenyonAstronomy Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHR. F. JamesonAstronomy Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RHS. T. HodgkinInstitute of Astronomy, Madingley Road, Cambridge CB3 0HAN. C. HamblyInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJM. R. S. HawkinsInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ

2002en

ABI

Аннотация

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 * 95 per cent photometrically complete to I C < 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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Идентификаторы

DOI: 10.1046/j.1365-8711.2002.05002.x

Цитирования и источники

Цитирований: 2Использованных источников: 0

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