We have used COSMOS scans of photographic plates taken by the Palomar Oschin Schmidt telescope (as part of the original Palomar Sky Survey) and by the UK Schmidt telescope to obtain proper motions for ~ 450 000 stars within a 112-degree region covering part of the Hyades cluster. With epoch differences of 33 to 37 yr, we have obtained proper motions accurate to 6-12 mas/yr and have identified 393 candidate Hyads to a limiting magnitude of Mv ~ +15.5, including at least two new white dwarf candidates. The main-sequence luminosity function determined from our sample is similar to that defined by local field stars, with a broad maximum at Mv ~ +12. Deriving distances from mu u, the proper motion towards the convergent point, and the space velocity determined by Gunn et al., we find stars with motions consistent with membership at distances of more than 15pc from the cluster centre. Moreover, both the line-of-sight and surface density distributions show evidence for significant mass segregation - indeed, the overall proper motion distribution suggests a tight core centred within a much broader distribution. We derive a total mass of 410-480Sun and a gravitational binding radius of ~ 10.5pc.

Cone search capability for table J/MNRAS/257/257/table8 (Candidate Hyades)

Cone search capability for table J/MNRAS/257/257/app-b (Appendix B: Giclas stars)

Cone search capability for table J/MNRAS/257/257/app-c (Appendix C: Hanson stars)

Cone search capability for table J/MNRAS/257/257/app-d (Appendix D: Leiden (Pels et al.) stars)

Cone search capability for table J/MNRAS/257/257/app-e (Appendix E: Luyten stars)

Cone search capability for table J/MNRAS/257/257/app-f (Appendix F: Leggett & Hawkins stars)

Cone search capability for table J/MNRAS/257/257/app-a (CCD Photometric sequences)