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J/A+A/315/384       Binarity among B-stars in NGC 6231 (Raboud, 1996)
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Binarity among B-stars in NGC 6231
       Raboud D.
      <Astron. Astrophys. 315, 384 (1996)>
      =1996A&A...315..384R      (SIMBAD/NED BibCode)
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ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: cluster: open: individual: NGC 6231 - technique: radial velocities -
          binary: general; spectroscopic

Description:
    We have measured radial velocities for 53 B-type stars, between B1 and
    B9, in the young open cluster NGC 6231 through a cross-correlation
    technique with synthetic spectra. Two measurements for 36 stars of the
    sample were obtained with a time separation of about two years. We
    derived a minimum binary fraction of 52% in the considered
    population. The velocity determination precisions were simulated and
    we analysed their dependence upon the S/N ratios of the spectra and
    upon the stellar rotational velocities. We discuss the selection of
    the templates for the correlation.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe        80        .   This file
table3       144       97   Results for all programme stars
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Byte-by-byte Description of file: table3
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   Bytes Format Units   Label     Explanations
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   1-  4  I4    ---     Number    []? Star number from Seggewiss
                                                           (1968VeBon..79....1S)
  13- 18  F6.3  mag     Vmag      []? V magnitude
  24- 28  F5.3  mag     [B-V]     []? Color index
  34- 38  I5    K       Teff      []? Effective temperature calculated (1)
  40- 42  A3    ---   n_Teff      Remark on Teff determination (2)
  47- 49  I3    km/s    Vsini     []? Rough determination of Vsini (3)
  56- 58  A3    ---   r_Teff      Source of the photometry and Teff (4)
  71- 81  F11.3 ---     JD        Julian Date of the observation
  90- 94  F5.1  km/s    RV        []? Radial velocities
  97-100  A4    ---   n_RV        SBII characteristic of the star (5)
 103-105  F3.1  km/s  e_RV        []? Radial velocity uncertainties (6)
 113-117  F5.1  km/s    RVdiff1   []? Radial velocity differences (7)
 120-123  F4.1  km/s    RVdiff2   []? Radial velocity differences (7)
 129-133  F5.1  km/s    RVdiff3   []? Radial velocity differences (8)
 136-139  F4.1  km/s    RVdiff4   []? Radial velocity differences (8)
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Note (1): See Sect. 3.2.1 of the paper.
Note (2): The question mark in brackets indicates that the determination is
    possibly outside the validity range of the Q parameter (see Sect. 3.2.1).
Note (3): See Sect. 3.2.2.
Note (4): GE is for the Geneva photometry, pe for UBV photoelectric and pg for
    UBV photographic photometry. The digits have the following significations:
    1 = Teff from Spectral Type estimated from equivalent widths
        (Didelon 1982A&AS...50..199D)
    2 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G),
        Teff from Van Genderen et al. (1984A&AS...58..537V)
    3 = Seggewiss (1968VeBon..79....1S)
    4 = V and [B-V] from Seggewiss (1968VeBon..79....1S), Teff calculated from
        uvby photometry (Shobbrook 1983MNRAS.205.1229S)
    5 = Garrison & Schild (1979AJ.....84.1020G)
    6 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G),
        Teff calculated from uvby photometry (Shobbrook 1983MNRAS.205.1229S)
    7 = V and [B-V] from Geneva photometry,
        Teff from Spectral Type (Kilian et al. 1994A&A...284..437K) and
        Vsini from Kilian et al. (1994A&A...284..437K)
    8 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G),
        Teff from Spectral Type (Garrison & Schild 1979AJ.....84.1020G)
    9 = Heske & Wendker (1984A&AS...57..205H)
Note (5): See Sect. 6.1.4.
Note (6): Radial velocity uncertainties, obtained from the simulations
    described in Sect. 4, using a fixed B1 synthetic spectrum for all cases,
    and adapted in order to reproduce exactly the conditions of the radial
    velocity determinations for the two runs (i.e. without the region between
    430 nm and 440 nm, see Sect. 3.3).
Note (7): Differences between radial velocities of column RV.
Note (8): Differential radial velocities obtained without any template
           (see text).
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Acknowledgements: Didier Raboud <Didier.Raboud@obs.unige.ch>
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(End)        Raboud [University of Lausanne], Patricia Bauer [CDS]   14-May-1996