Proper motions from Schmidt plates. II - The Hyades

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Open Clusters, Photographic Plates, Schmidt Telescopes, Stellar Motions, Astrometry, Astronomical Photometry, Calibrating, Color-Magnitude Diagram, Stellar Luminosity, White Dwarf Stars

Scientific paper

COSMOS scans of photographic plates taken by the Palomar Oschin Schmidt telescope and by the UK Schmidt telescope are used to obtain proper motions for about 450,000 stars within a 112-sq-deg region covering part of the Hyades luster. With epoch differences of 33 to 37 yr, proper motions accurate to 6-12 milliarcsec/yr are obtained, and 393 candidate Hyades to a limiting magnitude of about 15.5, including at least two new white dwarf candidates, are identified. The main-sequence luminosity function determined from this sample is similar to that defined by local field stars, with a broad maximum at about +12. Both the line-of-sight and surface density distributions show evidence for significant mass segregation; the overall proper motion distribution suggests a tight core centered within a much broader distribution. A total mass of 410-480 solar masses and a gravitational binding radius of about 10.5 pc are derived.

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