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J/ApJS/73/671       M87 globular clusters BVI photometry        (Couture+, 1990)
BVI photometry of globular clusters in M87
       COUTURE J., HARRIS W.E., ALLWRIGHT J.W.B.
      <Astrophys. J. Suppl. Ser. 73, 671 (1990)>
      =1990ApJS...73..671C      (SIMBAD/NED Reference)
ADC_Keywords: Clusters, globular; Photometry, CCD

Keywords: clusters: globular - galaxies: individual (M87) - stars: abundances


Abstract:
   We present CCD photometry in B, V, and I for a sample of globular clusters
   in the Virgo central giant elliptical galaxy M87. Our measured sample
   comprises  270 objects brighter than V∼23.4mag and with distances r>25"
   (>2kpc) from the center of the galaxy. In agreement with the recent study
   of Cohen, we find no detectable gradient of mean cluster color (metallicity)
   in (B-V) or (V-I) with radial distance. The cluster system does, however,
   display a large dispersion in color at any radius, corresponding to
   sigma([Fe/H])∼0.6 about a mean metallicity (Fe/H]≳-1.1 according to our
   color index scale. The difference in mean color between the globular
   clusters and the underlying halo light of the galaxy itself, found
   previously by Strom and coworkers and by Cohen, shows up strongly in all
   of our color indices; we find virtually no clusters as red as mean color
   of the halo stars at any radius.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2            50      273   BVI photometry of M87 globular clusters


Byte-by-byte Description of file: table2

   Bytes Format  Units   Label    Explanations

   1-  3  I3     ---     SeqNum   Starlike sequential number
   6- 10  F5.1   pix     Xpos     X position
  13- 17  F5.1   pix     Ypos     Y position
  20- 24  F5.1   arcsec  Dist     Distance
  28- 32  F5.2   mag     Vmag     V magnitude
  34- 38  F5.2   mag     B-V      (B-V) color
  40- 44  F5.2   mag     V-I      (V-I) color
  47- 50  I4     ---     S6       []? Cross-identification with S6 catalog


References:
   Cohen J.G., 1988, A.J., 95, 682
   Strom S.E. at al., 1981, Ap.J., 245, 416 (S6)

Historical Notes: Keypunched at CDS

(End)                      Marie-Jose Wagner, Patricia Bauer [CDS]   27-Feb-1995