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J/A+AS/100/243      Proper motions in M 67 (Zhao+ 1993)
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Study of proper motions in the region of the open cluster M67
and membership of stars
    Zhao J.L., Tian K.P., Pan R.S., He Y.P., Shi H.M.
   <Astron. Astrophys. Suppl. Ser. 100, 243 (1993)>
   =1993A&AS..100..243Z
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ADC_Keywords: Clusters, open ; Proper motions
Keywords: open cluster, proper motion, membership

Abstract:
    Relative proper motions and membership probabilities of 1046 stars in
    the open cluster M67 are are determined from PDS measurements of 9
    plate pairs taken with the double astrograph at the Zo-Se station
    Shanghai Observatory, which has an aperture of 40cm, a focal length of
    6.9m and a scale of 30"/mm. The number of stars with membership
    probabilities higher than 0.8 and at a distance less than 45' from the
    field center is 282. The average standard errors of proper motions
    vary from +/-0.0004"/yr for bright stars in the inner part of the
    field to some +/-0.0015"/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 wit those obtained by Sanders
    (1977A&AS...27...89S) or Girard et al. (1989AJ.....98..227G).

Objects:
    ----------------------------------------------------------
       RA  (2000)  DE    Designation(s)
    ----------------------------------------------------------
     08 50.4    +11 49   M 67 = NGC 2682
    ----------------------------------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table6.dat         67     1046   The catalogue of proper motions and membership
                                  probabilities in M 67
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See also:
    II/123 : UBV Photometry of Faint Stars (V>14.5) in M67 (Frolov+ 1986)
    V/52 : Photometry and Proper Motions of stars in M67 (Frolov+ 1986)
    J/AJ/106/181 : CCD photometry of open cluster M67 (Montgomery+ 1993)
    J/AJ/112/628 : Deep Wide-Field Spectrophotometry of M67 (Fan+ 1996)
    J/other/BaltA/7.369 : M67 CCD photometry (Boyle+, 1998)

Byte-by-byte Description of file: table6.dat
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   Bytes Format Units       Label    Explanations
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   1-  4  I4    ---         No       Sequential number (1)
       5  A1    ---       n_No       [*] Unexplained note
   6-  9  I4    ---         Sanders  ? Sanders (1977A&AS...27...89S)
                                        identification number
  11- 17  F7.3  cm          Xpos     X position (2)
  19- 24  F6.3  cm          Ypos     Y position (2)
  26- 30  F5.2  mag         Bmag     B magnitude (3)
  32- 36  F5.2  mag         Vmag     ? V magnitude (3)
  38- 42  F5.2  arcsec/yr   pmX      Proper motion along X direction
  44- 48  F5.2  arcsec/yr   pmY      Proper motion along Y direction
  50- 53  F4.2  arcsec/yr e_pmX      rms uncertainty on pmX
  55- 58  F4.2  arcsec/yr e_pmY      rms uncertainty on pmY
  60- 61  I2    %           P1       Membership probability, this study
  63- 64  I2    %           P2       ? Membership probability, Sanders'
                                        catalogue (1977A&AS...27...89S)
      67  I1    ---         N        Number of measured plate pairs
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Note (1): Stars 894 and 1024 are BD +12 1926 and BD +12 1927, respectively
Note (2): Coordinates from PDS measurements on plate 340
Note (3): Magnitudes from Sanders (1977A&AS...27...89S) or calculated on the
           basis of their PDS magnitudes for stars with no magnitude data
           available in the Sanders' catalogue
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History: Prepared via OCR at CDS.
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(End)                         James Marcout,   Patricia Bauer [CDS]  20-Mar-1997