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J/A+A/324/915       Blue stragglers in M3     (Ferraro+ 1997)
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HST observations of Blue Stragglers stars in the core of the globular cluster M3
     Ferraro F.R., Paltrinieri B., Fusi Pecci F., Cacciari C., Dorman B.,
     Rood R.T., Buonanno R., Corsi C.E., Burgarella D., Laget M.
    <Astron. Astrophys. 324, 915 (1997)>
    =1997A&A...324..915F      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, globular ; Stars, blue ; Photometry, ultraviolet
Keywords: clusters: globular: M 3 - stars: population II -
          stars: blue stragglers
Mission_Name: HST

Abstract:
    The core of the Galactic Globular Cluster M 3 (NGC 5272) has been
    observed with the WFPC2 through the filters F255W, F336W, F555W, and
    F814W. Using these observations along with a thorough reanalysis of
    earlier catalogs, we have produced a catalog of blue straggler stars
    (BSS) spanning the cluster. Earlier studies and the fainter part of
    our sample suffer severe selection biases. Our analysis is based on a
    more reliable bright global sample of 122 BSS. We confirm earlier
    suggestions that the radial BSS distribution in M 3 is bimodal. It is
    strongly peaked in the center, has a clear dip 100-200" from the
    center, and rises again at larger radii. The observed distribution
    agrees with the dynamical model of Sigurdsson et al.
    (1994ApJ...431L.115S) which takes into account both star collisions
    and merging of primordial binaries for the origin of BSS. The observed
    luminosity functions of BSS in the inner and outer parts of the
    cluster are different. Interpreting these using the models of Bailyn &
    Pinsonneault (1995ApJ...439..705B), we suggest that the BSS in the
    inner cluster are formed by stellar collisions and those in the outer
    cluster from merging primordial binaries.

Objects:
    -----------------------------------------
       RA   (2000)   DE    Designation(s)
    -----------------------------------------
     13 42.2      +28 23   M 3 = NGC 5272
    -----------------------------------------

File Summary:
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  FileName   Lrecl  Records   Explanations
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ReadMe          80        .   This file
table2          69       72   V,I,U,UV(F255W) photometry of 72 bright BSS in M 3
table3          69       99   V,I,U,UV(F255W) photometry of 99 faint  BSS in M 3
table4          70      263   Global sample of 263 BSS in M3
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Byte-by-byte Description of file: table2 table3
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   Bytes Format Units   Label     Explanations
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   1-  5  I5    ---     Star      Star designation (this paper)
   9- 14  F6.3  mag     Vmag      V magnitude
  18- 23  F6.3  mag     Imag      I magnitude
  27- 32  F6.3  mag     Umag      U magnitude
  36- 41  F6.3  mag     UVmag     UV (F255W) magnitude
  43- 50  F8.3  arcsec  Xpos      X coordinate
  52- 59  F8.3  arcsec  Ypos      Y coordinate
  62- 68  F7.3  arcsec  Dist      Distance from the cluster center
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Byte-by-byte Description of file: table4
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   Bytes Format Units   Label     Explanations
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   2-  4  I3    ---     BSS       BSS designation in the global sample
   6- 13  A8    ---     Name      Original (this or previous papers)
                                   identification number (1)
      14  A1    ---   n_Name      [+] +: BSS in the global bright sample
  18- 23  F6.3  mag     Vmag      V magnitude
  25- 32  F8.3  arcsec  Xpos      X coordinate
  34- 41  F8.3  arcsec  Ypos      Y coordinate
  44- 50  F7.3  arcsec  Dist      Distance from the cluster center
  52- 55  I4    ---     GYBS      ? Identification number in GYBS,
                                      1994AJ....108.1786G
      56  A1    ---   n_GYBS      [no] Note on GYBS (2)
  57- 60  I4    ---     BHS       ? Identification number in BHS,
                                      1993ApJ...408L..89B
      61  A1    ---   n_BHS       [no] Note on BHS (2)
  62- 64  I3    ---     BPQ       ? Identification number in BPQ,
                                      1995A&A...301..675B
      65  A1    ---   n_BPQ       [no] Note on BPQ (2)
  67- 69  I3    ---     F93       ? Identification number in F93,
                                      1993AJ....106.2324F
      70  A1    ---   n_F93       [no] Note on F93 (2)
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Note (1): HST: Hubble Space Telescope
          F93: Ferraro et al., 1993AJ....106.2324F
          S53: Sandage, 1953AJ.....58...61S
          BHS: Bolte et al., 1993ApJ...408L..89B
Note (2): n: BSS candidate is located in the field of view of that survey but
              was not identified as a BSS
          o: BSS is located out of the field of view
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Acknowledgements: F.R. Ferraro <FERRARO@astbo3.bo.astro.it>

References:
  Bolte et al., BHS         =1993ApJ...408L..89B
  Burgarella et al., BPQ    =1995A&A...301..675B
  Ferraro et al., F93       =1993AJ....106.2324F
  Guhathakurta et al., GYBS =1994AJ....108.1786G
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(End)                                         Patricia Bauer [CDS]   24-Feb-1997