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J/AJ/121/2189   Stars within 8 pc of the Sun                (Oppenheimer+, 2001)
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A coronagraphic survey for companions of stars within 8 parsecs.
    Oppenheimer B.R., Golimowski D.A., Kulkarni S.R., Matthews K., Nakajima T.,
    Creech-Eakman M., Durrance S.T.
   <Astron. J. 121, 2189 (2001)>
   =2001AJ....121.2189O
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ADC_Keywords: Stars, nearby ; Stars, double and multiple ;
              Parallaxes, trigonometric ; Proper motions
Keywords: binaries: visual - stars: low-mass, brown dwarfs - stars: statistics

Abstract:
    We present the technique and results of a survey of stars within 8pc
    of the Sun with declinations {delta}>-35{deg} (J2000.00). The survey,
    designed to find without color bias faint companions, consists of
    optical coronagraphic images of the 1 field of view centered on each
    star and infrared direct images with a 32" field of view. The images
    were obtained through the optical Gunn r and z filters and the
    infrared J and K filters. The survey achieves sensitivities up to 4
    absolute magnitudes fainter than the prototype brown dwarf, Gliese
    229B. However, this sensitivity varies with the seeing conditions, the
    intrinsic brightness of the star observed, and the angular distance
    from the star. As a result, we tabulate sensitivity limits for each
    star in the survey. We used the criterion of common proper motion to
    distinguish companions and to determine their luminosities. In
    addition to the brown dwarf Gl 229B, we have identified six new
    stellar companions of the sample stars. Since the survey began,
    accurate trigonometric parallax measurements for most of the stars
    have become available. As a result, some of the stars we originally
    included should no longer be included in the 8pc sample. In addition,
    the 8pc sample is incomplete at the faint end of the main sequence,
    complicating our calculation of the binary fraction of brown dwarfs.
    We assess the sensitivity of the survey to stellar companions and to
    brown dwarf companions of different masses and ages.

File Summary:
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 FileName    Lrecl  Records   Explanations
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ReadMe          80        .   This file
table1.dat     101      167   The 8 pc Sample
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See also:
   III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)
   I/238   : Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
   V/70    : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  6  F6.2  mas     plx       Parallax
       7  A1    ---   m_plx       Component designation in a multiple system
   9- 10  I2    h       RAh       Right Ascension (J2000) (1)
  12- 13  I2    min     RAm       Right Ascension (J2000) (1)
  15- 19  F5.2  s       RAs       Right Ascension (J2000) (1)
      21  A1    ---     DE-       Sign of the Declination (J2000) (1)
  22- 23  I2    deg     DEd       Declination (J2000) (1)
  25- 26  I2    arcmin  DEm       Declination (J2000) (1)
  28- 31  F4.1  arcsec  DEs       Declination (J2000) (1)
  33- 40  F8.2  mas/yr  pmRA      ? Proper motion in Right Ascension
  42- 49  F8.2  mas/yr  pmDE      ? Proper motion in Declination
  51- 55  F5.2  mag     Vmag      ? The V band magnitude
  57- 65  A9    ---     CNS3      The Third Catalog of Nearby Stars name (4)
  67- 76  A10   ---     BD/CD     The Durchmusterung name
                                   Bd (Cat. <I/71>) or CD (Cat. <I/108>)
  78- 87  A10   ---     OName     Other name
      89  A1    ---   l_MajAxis   Limit flag on MajAxis
  90- 96  F7.2  AU      MajAxis   ? The semi-major axis (2)
      98  A1    ---   r_plx       Reference code for plx (3)
      99  A1    ---   r_RAm       Reference code for the position (3)
     100  A1    ---   r_Vmag      Reference code for Vmag (3)
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Note (1): Coordinates include the proper motion and precession.
Note (2): Derived from the projected separation if the companion is visibly
     detected or the radial velocity orbital solution
Note (3):
    G = Reid et al., 1995, Cat. <III/198>
    C = Third Catalog of Nearby Stars, Cat. <V/70>
    H = Hipparcos, Cat. <I/239>
    Y = Yale catalog, Cat. <I/238>
Note (4): stars without name in the CNS3 have been assigned a number
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History:
    From electronic version of the journal
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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    30-Aug-2001