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J/A+AS/124/353      CCD UBV photometry of close visual doubles (Nakos+ 1997)
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UBV absolute CCD photometry and differential astrometry of
close visual double stars, with G-type primaries.
      Nakos T., Sinachopoulos D., van Dessel E.
     <Astron. Astrophys. Suppl. Ser. 124, 353 (1997)>
     =1997A&AS..124..353N      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, double and multiple ; Photometry, CCD ; Photometry, UBV
Keywords: binaries: visual - catalog

Abstract:
    We present V magnitudes, (B-V) and (U-B) colours of close visual
    double star components, and their differences as well as separations
    and position angles of 40 visual double stars. The common properties
    of the members of this sample are the small angular separation {rho},
    which is less than 7", and the common spectral type of the primaries,
    which are of G-type. The observations made with the Bessel U, B and V
    filters, while the astrometry was performed in the V filter only. For
    the observations, the CCD camera attached to the Cassegrain focus of
    the 90 cm Dutch telescope, at La Silla, Chile, had been used. From the
    analysis of the data we concluded that from the sample of the fourty
    double stars observed seven proved to be physical pairs, while the
    rest must have common origin components.

File Summary:
--------------------------------------------------------------------------------
  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table1             58       39   Astrometric results
table2             45       80   Photometric results
table3             38       40   Photometric differences and angular separation
                                  of the components
tables.tex         78      313   LaTeX version of the tables
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Byte-by-byte Description of file: table1
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   Bytes Format Units     Label     Explanations
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   1-  3  I3    ---       No        Visual binary number
   5-  6  I2    h         RAh       Right ascension (J2000)
   8- 11  F4.1  min       RAm       Right ascension (J2000)
      13  A1    ---       DE-       Declination sign
  14- 15  I2    deg       DEd       Declination (J2000)
  17- 18  I2    arcmin    DEm       Declination (J2000)
  20- 28  A9    ---       DM        Durchmusterung designation of the primary
  30- 34  F5.3  arcsec    rho       Angular separation
  36- 39  F4.3  arcsec  e_rho       rms uncertainty on rho (1)
  41- 47  F7.3  deg       Theta     Position angle
  49- 51  F3.2  deg     e_Theta     rms uncertainty on Theta
  53- 58  F6.1  yr        Obs       Epoch of observation
--------------------------------------------------------------------------------
Note (1): The very small values of e_rho are due to the assumption of
           {sigma}_r_({rho})=0. We took {sigma}_r_({rho})=0 for the error
           of the angular separation rho due to the atmospheric refraction.
           Realistic values of e_rho are probably one order of magnitude higher
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Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     No        Visual binary number
   4- 12  A9    ---     DM        DM number
      13  A1    ---   m_DM        Multiplicity index on DM
  15- 20  F6.3  mag     Vmag      V magnitude
  22- 24  F3.2  mag   e_Vmag      rms uncertainty on Vmag
  26- 30  F5.3  mag     B-V       B-V colour index
  32- 34  F3.2  mag   e_B-V       rms uncertainty on B-V
  36- 41  F6.3  mag     U-B       U-B colour index
  43- 45  F3.2  mag   e_U-B       rms uncertainty on U-B
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table3
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     No        Visual binary number
   4- 12  A9    ---     DM        DM or ADS number
  14- 18  F5.3  arcsec  rho       ? Angular separation
  20- 24  F5.3  mag     DVmag     Difference in V magnitude
  26- 31  F6.3  mag     D(B-V)    Difference in B-V colour index
  33- 38  F6.3  mag     D(U-B)    Difference in U-B  colour index
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Acknowledgements: Dimitris Sinachopoulos <Dimitris.Sinachopoulos@oma.be>
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(End)                                         Patricia Bauer [CDS]   03-Dec-1996