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J/AJ/112/1489       Spectroscopic survey for binaries in NGC 5053  (Yan+ 1996)
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A spectroscopic survey for binary stars in the globular cluster NGC 5053.
     Yan L., Cohen J.G.
    <Astron. J. 112, 1489 (1996)>
    =1996AJ....112.1489Y
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ADC_Keywords: Clusters, globular ; Binaries, spectroscopic ; Radial velocities

Abstract:
    We carried our a radial velocity survey for spectroscopic binaries in
    the low-density globular cluster NGC 5053. Our sample contains a total
    of 77 cluster member giant and subgiant stars with visual magnitudes
    of 14.5-18.6. Of These 77 stars, 66 stars have on average of 3-4
    measurements with a total of 236 velocities. A typical velocity error
    per measurement is 13km/s. The stars in our sample are spatially
    distributed from the cluster center out to 10arcmin in radius (4.5
    core radii). Among theses 66 stars with multiple velocity
    measurements, we discovered 6 spectroscopic binary candidates.

File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2a            62      248   Relative radial velocities of stars in NGC 5053
                                  (individual data)
table2b            78       77   Relative radial velocities of stars in NGC 5053
                                  (average data)
table2.tex        234      469   TeX version of table 2
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Byte-by-byte Description of file: table2a
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   Bytes Format Units   Label     Explanations
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   1-  5  A5    ---     Star      Star identification name
   7-  8  I2    h       RAh       Right ascension (1950)
  10- 11  I2    min     RAm       Right ascension (1950)
  13- 18  F6.3  s       RAs       Right ascension (1950)
      19  A1    ---     DE-       Declination sign
  20- 21  I2    deg     DEd       Declination (1950)
  23- 24  I2    arcmin  DEm       Declination (1950)
  26- 31  F6.3  arcsec  DEs       Declination (1950)
  33- 37  F5.1  arcsec  Dist      Radial distance from the cluster
  39- 50  F12.4 d       HJD       Heliocentric Julian date of observation
  52- 56  F5.1  km/s    HRV       Heliocentric radial velocity
  58- 61  F4.1  km/s  e_HRV       rms uncertainty on HRV
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Byte-by-byte Description of file: table2b
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   Bytes Format Units   Label     Explanations
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   1-  5  A5    ---     Star      Star identification name
   7-  8  I2    h       RAh       Right ascension (1950)
  10- 11  I2    min     RAm       Right ascension (1950)
  13- 18  F6.3  s       RAs       Right ascension (1950)
      19  A1    ---     DE-       Declination sign
  20- 21  I2    deg     DEd       Declination (1950)
  23- 24  I2    arcmin  DEm       Declination (1950)
  26- 31  F6.3  arcsec  DEs       Declination (1950)
  33- 37  F5.1  arcsec  Dist      Radial distance from the cluster
  39- 40  I2    ---   o_VR        Number of observations
  42- 46  F5.1  km/s    VR        Weighted mean radial velocity (1)
  48- 51  F4.1  km/s  e_VR        External velocity error in a single
                                   measurement estimated from the dispersion
                                   about the mean
  53- 60  F8.3  ---     chi2      ? Radial velocity variability over the
                                     timespan of three years
  62- 67  F6.4  ---     P(<chi2)  ? Probability (2)
  69- 73  F5.2  mag     V0mag     Deredenned V magnitude (3)
  75- 78  F4.2  mag     (B-V)0    ? Deredenned B-V colour index (3)
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Note (1): When o_VR=1, only one measurement
Note (2): To evaluate the significance of the variations represented by chi2,
           we calculated the probability P(<chi2) of having a chi2 at least
           this large purely due to chance fluctuations with a Gamma function
           Q(0.5{nu}, 0.5chi2), here {nu} is the number of the degree of
           freedom. Reasonable limits of chi2 probability for identifying
           significant variations are 0.01-0.001.
Note (3): Photmetry for stars beginning by S is from
           Sandage et al. (1977AJ.....82..389S)
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Acknowledgements: Lin Yan <lyan@eso.org>
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(End)                                         Patricia Bauer  [CDS]  17-Nov-1997