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J/A+A/313/129      Positions and magnitudes of M30 blue stars (Burgarella+ 1996)
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Stellar populations and color gradients in the post core collapse
globular cluster M30
      Burgarella D., Buat V.
     <Astron. Astrophys. 313, 129 (1996)>
     =1996A&A...313..129B      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, globular ; Stars, blue
Keywords: globular cluster: individual: Messier 30 - stars: population II -
          stars: evolution

Abstract:
    Sub-arcsec B and V images of the central 2.5arcmin of the
    post-core-collapse globular cluster M 30 are used to study the stellar
    populations lying in the central parts of this cluster and to analyze
    the influence of the stellar content on the radial color gradient
    reported for this cluster. We find a populated blue horizontal branch
    which follows a flat radial distribution. The red giants (defined as
    the objects above the horizontal branch in this paper) are found to be
    depleted relatively to the other bright detected stellar populations.
    A highly concentrated population of 42 blue stragglers has also been
    detected. The presence of a B-V color gradient (0.20-0.24mag/dex) is
    confirmed. A blueing is detectable from the cluster center out to the
    edge of the images at r=~1arcmin. None of the detected bright stellar
    populations (red giant branch, horizontal branch, asymptotic giant
    branch and blue straggler stars) is found to be at the origin of this
    gradient. This result suggests that the stellar population(s)
    responsible for this gradient has still to be identified. Some
    plausible candidates are tentatively proposed in this paper.

Objects:
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     RA  (2000)  DE    Designation(s)
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    21 40.3   -23 11   M 30 = NGC 7099 = C 2137-234
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File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             36      103   Positions and magnitudes of the detected
                                  blue horizontal branch stars
table2             36       42   Positions and magnitudes of the detected
                                  blue straggler stars
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Byte-by-byte Description of file: table1 table2
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   Bytes Format Units   Label     Explanations
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   1-  4  I4    ---     ID        Identification number of the star
   6- 11  F6.2  arcsec  Xpos      X position relative to our center (see paper)
  13- 18  F6.2  arcsec  Ypos      Y position relative to our center (see paper)
  20- 24  F5.2  arcsec  Rpos      Radial distance to our center (see paper)
  26- 30  F5.2  mag     Vmag      V magnitude
  32- 36  F5.2  mag     B-V       B-V color
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Courtesy: Denis Burgarella <burgarella@lasm0a.astrsp-mrs.fr>
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(End)                                         Patricia Bauer [CDS]   10-Apr-1996