J/A+AS/100/243 Proper motions in M 67 (Zhao+ 1993)
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 1993A&AS..100..243Z
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 1977A&AS...27...89S) or Girard et al. (1989AJ.....98..227G 1989AJ.....98..227G).
Objects:
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RA (2000) DE Designation(s)
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08 50.4 +11 49 M 67 = NGC 2682
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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/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 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 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 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.
(End) James Marcout, Patricia Bauer [CDS] 20-Mar-1997