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J/A+AS/102/397    Colour magnitude diagram of M13              (Guarnieri+ 1993)
Colour magnitude diagram for the globular cluster M13
      Guarnieri M. D., Bragaglia A., Fusi Pecci F.
     <Astron. Astrophys. Suppl. Ser. 102, 397 (1993)>
     =1993A&AS..102..397G
ADC_Keywords: Clusters, globular; Photometry, CCD; Colors

Keywords: clusters: globulars: M13 - stars: evolution -
          stars: colour magnitude diagram - photometry: CCD

Description:
    Two overlapping regions of M13 were observed on April 24, 1989 at the
    Loiano Observatory with a CDCD camera. A Colour-Magnitude diagram down
    to the main sequence was derived, as a preliminary search for the blue
    Horizontal Branch stars in this cluster.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    ----------------------------------------------------------
    16 41 41.4 +36 27 37   M 13  = NGC 6205 = C 1639+365
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        31     3532  *B, B-V and positions for 3532 stars in M13

Note on table1.dat: the table contains B and B-V values, not V and B-V
     as announced in the paper.


See also:
    J/AJ/113/669 : Stars in M13 core (Cohen+ 1997)
    J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)
    J/AJ/122/3219 : M3 and M13 CCD BV photometry (Rey+ 2001)


Byte-by-byte Description of file: table1.dat

   Bytes Format  Units   Label    Explanations

   1-  5  I5     ---     Num     *Identification Number
   7- 11  F5.2   mag     Bmag     B magnitude (not Vmag, si "History" section)
  13- 17  F5.2   mag     B-V      B-V colour
  19- 24  F6.2   pix     X        X position (increases to West, 0.5"/pix)
  26- 31  F6.2   pix     Y        Y position (increases to South, 0.5"/pix)

Note on Num: the star appears as  Cl* NGC 6205 GBF nnnnn in Simbad



History:
  * 17-Jun-1999: Thanks to a note from Wayne Osborn, and a confirmation
    by Angela Bragaglia, the magnitude listed was relabelled to Bmag,
    instead of Vmag.
(End)                                           Patricia Bauer [CDS] 14-Oct-1993