Access to Astronomical Catalogues

J/A+AS/127/423      VI photometry of Westerlund 1 and 2  (Piatti+ 1998)
Fundamental parameters of the highly reddened young open clusters
Westerlund 1 and 2
       Piatti A.E., Bica E., Claria J.J.
      <Astron. Astrophys. Suppl. Ser. 127, 423 (1998)>
      =1998A&AS..127..423P      (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CCD

Keywords: open clusters: individual: Weterlund 1, Westerlund 2 -
          open clusters: general - HR diagram

Description:
    We have carried out CCD observations of stars in the region of the
    open cluster Westerlund 1 through the V and I passbands. The direct
    images were obtained with the 24-inch telescope of the University of
    Toronto Southern Observatory situated at Las Campanas Observatory,
    Chile. After cross-correlating all independent V, (V-I) tables we have
    obtained a improved set of colour and magnitude values as compared to
    those based on a single measure.
Objects:
    ----------------------------------------------------------
        RA  (2000)  DE    Designation(s)
    ----------------------------------------------------------
    16 48.2      -45 50   Westerlund 1 = C 1644-457
    10 23.9      -57 45   Westerlund 2 = C 1022-575
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table             59      233   Photometric data


See also:
    J/ApJS/116/263 : VI photometry of open clusters   (Piatti+ 1998)


Byte-by-byte Description of file: table

   Bytes Format Units   Label     Explanations

   1-  3  A3    ---     ID        Star number
   7- 12  F6.2  pix     Xpos      X coordinate (1)
  16- 21  F6.2  pix     Ypos      Y coordinate (1)
  25- 30  F6.3  mag     Vmag      V magnitude
  34- 38  F5.3  mag     e_Vmag    ? V magnitude error
  42- 46  F5.3  mag     V-I       V-I colour
  50- 54  F5.3  mag     e_V-I     ? V-I colour error
      58  I1    ---     o_Vmag    Number of measurements

Note (1): X and Y coordinates increase toward the north and west, respectively.



Acknowledgements: Andres Piatti 

(End)                                         Patricia Bauer [CDS]   02-Jun-1997