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J/AJ/111/1205  Proper-Motion Membership of Open Cluster NGC 188  (Dinescu+ 1996)
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A Proper-Motion Membership Study of the Old Open Cluster NGC 188           
    Dinescu D.I., Girard T.M., van Altena W.F., Yang T., Lee Y.-W. 
    <Astron. Journ. 111, 1205 (1996)>
    =1996AJ....111.1205D
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ADC_Keywords: Clusters, open; Proper Motions

Description: 
   Relative proper motions have been determined for 1127 stars in 
   the field of the open cluster NGC 188 from plates spanning a 
   60-year interval, taken with the 76-cm Thaw refractor of the 
   Allegheny Observatory. Special attention has been paid to the 
   corrections for systematic errors as a function of magnitude and 
   color. 

   The study is complete to a magnitude B = 16.2. Also some stars
   brighter than B = 12.5 were eliminated from the study because 
   of the large uncertainty in estimating the magnitude equation at 
   the bright end. The final relative proper motions have an accuracy 
   of 0.5 mas/yr for well-exposed stars. From the cluster membership 
   probabilities based on proper motions we obtain 360 cluster 
   members, enabling us to better define the color-magnitude diagram.

   We provide a list of highly probable candidate blue stragglers
   in addition to the sample proposed by Eggen & Sandage (1969). 

File Summary:
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 FileName      Lrecl   Records    Explanations
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ReadMe            80        .     This file
table.dat        125     1127    *Master table
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Note on table.dat:
   The equatorial coordinates are at equinox J2000 and mean epoch 1983.91

Byte-by-byte Description of file: table.dat
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   Bytes  Format Units  Label  Explanations
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   1-  5   I5    ---    ID     identification number (AJ 111, 1205)
   6- 10   I5    ---    IDUP   ?identification number (Upgren at al. AJ 77, 74)
  11- 20   A10   ---    IDS    identification number (Sandage ApJ 135, 333)
  21- 26   F6.2  mag    V      V magnitudes (calibrated photographic magnitudes)
  27- 32   F6.2  mag    B-V    B-V colors
  33- 42   F10.4 mm     X      X coordinate 
  43- 52   F10.4 mm     Y      Y coordinate
  53- 55   I3    h      RAh    Right Ascension J2000 (h); mean epoch 1983.91
  56- 58   I3    min    RAm    Right Ascension J2000 (minutes)
  59- 66   F8.4  s      RAs    Right Ascension J2000 (seconds)
      67   A1    ---    DE-    Declination sign
  68- 69   I2    deg    DEd    Declination  J2000 (degrees)
  71- 72   I2    arcmin DEm    Declination  J2000 (arcminutes)
  73- 79   F7.3  arcsec DEs    Declination  J2000 (arcseconds)
  80- 87   F8.2  mas/yr pmX    Proper Motion in X (milliarcseconds/yr)
  88- 95   F8.2  mas/yr pmY    Proper Motion in Y
  96-101   F6.2  mas/yr e_pmX  Proper-motion error in X
 102-107   F6.2  mas/yr e_pmY  Proper-motion error in Y
 108-110   I3    %      Pc     Proper-motion membership probability 
 111-113   I3    %      Pcx    Proper-motion and spatial (combined) membership 
                                probability
 114-116   I3    ---    N      Number of plates on which the object was measured
 117-126   A10   ---    Notes *Explained at the end of the table
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Note on Notes: 
  1  - photoelectric standards used in the photometric calibration 
       (Sandage 77, 74)
  2  - photometry from McClure and Twarog ApJ 214, 111
  3  - photometry replaced from Caputo et al. AJ 99, 261
  4  - stars with no magnitudes estimates from Lick plates which 
       were used for the photometry
  5  - stars with only V magnitudes from the Lick plates
  BS - blue stragglers (Eggen and Sandage ApJ 158, 669)
  ER Cep, ES Cep, V5, V8, V9 - short-period variables 
                               (Kaluzny and Shara ApJ 314, 585) 
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(End)                         Paul Kuin (NASA/ADC)                   19-May-1997