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J/MNRAS/397/1073    UBVI photometry in NGC 2587              (Piatti+, 2009)
NGC 2587: a sparse open cluster projected on to a populous star field.
    Piatti A.E., Claria J.J., Ahumada A.V.
   <Mon. Not. R. Astron. Soc., 397, 1073-1083 (2009)>
   =2009MNRAS.397.1073P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI

Keywords: techniques: photometric -
          galaxy: open clusters and associations: general -
          Galaxy: open clusters and associations: individual: NGC 2587

Abstract:
    We present CCD photometry in the Johnson U, B and V and Kron-Cousins
    I passbands for the open cluster NGC 2587. The sample consists of 4406
    stars reaching down to V∼21.0. We developed a new method to clean
    statistically the colour-magnitude diagrams. NGC 2587 appears to be
    a sparse, relatively bright open cluster, with a few tens of members
    projected on to a populous star field.

Description:
    We obtained CCD images of the cluster field with the UBVIKC filters
    and the 0.9-m telescope at Cerro Tololo Inter-American Observatory
    (CTIO, Chile) during the night of 2000 December 28-29.
Objects:
    -----------------------------------------------
       RA (2000) DE   Designation(s)
    -----------------------------------------------
    08 23.5   -29 30  NGC 2587 = Cl Collinder 184
    -----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        92       33   Calibrated UBVI data of standard stars
table3.dat        82     4406   CCD UBVI data of stars in the field of NGC 2587


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     Name      Star name
  14- 19  F6.3  mag     Vmag      V magnitude
  21- 25  F5.3  mag     e_Vmag    rms uncertainty on Vmag
  27- 32  F6.3  mag     r(V)      Residual (calibrated standard value) in Vmag
  34- 39  F6.3  mag     U-B       U-B colour index
  41- 45  F5.3  mag     e_U-B     rms uncertainty on U-B
  47- 52  F6.3  mag     r(U-B)    Residual (calibrated standard value) in U-B
  54- 59  F6.3  mag     B-V       B-V colour index
  61- 65  F5.3  mag     e_B-V     rms uncertainty on B-V
  67- 72  F6.3  mag     r(B-V)    Residual (calibrated standard value) in B-V
  74- 79  F6.3  mag     V-I       V-I colour index
  81- 85  F5.3  mag     e_V-I     rms uncertainty on V-I
  87- 92  F6.3  mag     r(V-I)    Residual (calibrated standard value) in V-I


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Seq       [1/4406] Sequential number
   6- 13  F8.3  pix     Xpos      X position (1)
  15- 22  F8.3  pix     Ypos      Y position (1)
  24- 29  F6.3  mag     Vmag      V magnitude
  31- 35  F5.3  mag     e_Vmag    rms uncertainty on Vmag
      37  I1    ---     o_Vmag    Number of measurements in V band
  39- 44  F6.3  mag     U-B       ?=99.999 U-B colour index
  46- 50  F5.3  mag     e_U-B     ?=9.999 rms uncertainty on U-B
      52  I1    ---     o_U-B     Number of measurements in U-B
  54- 59  F6.3  mag     B-V       ?=99.999 B-V colour index
  61- 65  F5.3  mag     e_B-V     ?=9.999 rms uncertainty on B-V
      67  I1    ---     o_B-V     Number of measurements in B-V
  69- 74  F6.3  mag     V-I       ?=99.999 V-I colour index
  76- 80  F5.3  mag     e_V-I     ?=9.999 rms uncertainty on V-I
      82  I1    ---     o_V-I     Number of measurements in V-I

Note (1): North is up and east is to the left. 1pix=0.4arcsec.
 The bright star close to the cluster centre is HD 70927
 (No. 2096, x=896.643, y=1113.205, RA=08:23:37.7730, DE=-29:30:04.447, Eq=J2000)


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    09-Jun-2011