Study of proper motions in the region of the open cluster M67 and membership of stars

Mathematics – Probability

Scientific paper

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Kinematics, Open Clusters, Photographic Measurement, Photographic Plates, Stellar Motions, Astronomical Observatories, Error Analysis, Milky Way Galaxy, Probability Theory

Scientific paper

Relative proper motions and membership probabilities of 1046 stars in the open cluster M67 area are determined from PDS measurements of nine plate pairs taken with the double astrograph at the Zo-Se station of Shanghai Observatory, which has an aperture of 40 cm, a focal length of 6.9 m and a scale of 30 arcsec/mm. The number of stars with membership probabilities higher than 0.8 and at a distance less than 45 arcmin from the field center is 282. The average standard errors of proper motions vary from +/- 0.0004 arcsec/yr for bright stars in the inner part of the field to some +/- 0.00l5 arcsec/yr for faint stars in the outer part of the cluster. It is shown by a detailed discussion that the proper motions and membership probabilities of the stars determined in this paper are in quite satisfactory agreement with those obtained by Sanders (1977) or Girard et al. (1989).

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