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J/A+AS/143/409      Stock 2 CCD photometry and proper motions (Foster+, 2000)
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CCD photometry and proper motions of late-type stars in the
young open cluster Stock 2.
    Foster D.C., Theissen A., Butler C.J., Rolleston W.R.J., Byrne P.B.,
    Hawley S.L.
   <Astron. Astrophys. Suppl. Ser. 143, 409 (2000)>
   =2000A&AS..143..409F
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ADC_Keywords: Clusters, open ; Stars, late-type ; Photometry, CCD ;
              Photometry, UBVRI ; Proper motions
Keywords: stars: evolution - stars: late-type -
          open clusters: individual: Stock 2

Abstract:
    We present the results of the first CCD BVRI photometric and proper
    motion study of late-type stars in the young open cluster Stock 2.
    Twenty-one fields of approximately 5'x5' size have been observed
    photometrically, from which we have identified 118 candidate members
    based on their positions on colour-magnitude diagrams relative to
    theoretical isochrones. From a comparison of the known star density of
    the Pleiades, we estimate the contamination of this selection process
    due to background stars to be as large as ~50%. However, only 22 of
    those 118 candidate members have proper motions consistent with
    membership, suggesting that the contamination is of the order of 80%.
    Additional candidate members were found by means of a proper motion
    analysis of Schmidt plate material for a 3{deg}x3{ deg} field
    containing the cluster. The cluster proper motion allows us to
    separate members from background and foreground stars. We have found
    634 stars with a membership probability >=50% down to a limiting
    magnitude of B=~20, corresponding to late-M dwarfs at the distance of
    Stock 2.

Objects:
    ----------------------------------------------------------
       RA  (2000)  DE       Designation(s)
    ----------------------------------------------------------
    02 15 00    +59 16.0    Stock 2
    ----------------------------------------------------------

File Summary:
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 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table5.dat        49      634   Photographic photometry and proper motions of
                                 Stock 2 stars with a membership probability
                                 greater or equal than 50%, based on the proper
                                 motion analysis
appendix.dat      52     4078   Complete list of CCD photometry
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Byte-by-byte Description of file: table5.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (J2000)
   4-  5  I2    min     RAm       Right ascension (J2000)
   7- 11  F5.2  s       RAs       Right ascension (J2000)
      13  A1    ---     DE-       Declination sign (J2000)
  14- 15  I2    deg     DEd       Declination (J2000)
  17- 18  I2    arcmin  DEm       Declination (J2000)
  20- 23  F4.1  arcsec  DEs       Declination (J2000)
  26- 30  F5.2  mag     Bmag      B photographic magnitude
  32- 35  F4.2  mag     B-R       B-R photographic colour
  38- 42  F5.1  mas/yr  pmx       Proper motion in x (1)
  45- 49  F5.1  mas/yr  pmy       Proper motion in y (1)
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Note (1): x and y refers to the plate coordinates
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Byte-by-byte Description of file: appendix.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (J2000)
   4-  5  I2    min     RAm       Right ascension (J2000)
   7- 11  F5.2  s       RAs       Right ascension (J2000)
      13  A1    ---     DE-       Declination sign (J2000)
  14- 15  I2    deg     DEd       Declination (J2000)
  17- 18  I2    arcmin  DEm       Declination (J2000)
  20- 23  F4.1  arcsec  DEs       Declination (J2000)
  26- 31  F6.3  mag     Vmag      Johnson V magnitude
  33- 38  F6.3  mag     B-V       Johnson B-V colour
  40- 45  F6.3  mag     V-I       Johnson V-I colour
  47- 52  F6.3  mag     R-I       Johnson R-I colour
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Acknowledgements: Armin Theissen <ath@star.arm.ac.uk>

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(End)                                        Patricia Bauer [CDS]    02-May-2000