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J/AJ/141/52     Low-mass visual companions to nearby G-dwarfs  (Tokovinin, 2011)
Low-mass visual companions to nearby G-dwarfs.
    Tokovinin A.
   <Astron. J., 141, 52 (2011)>
   =2011AJ....141...52T
ADC_Keywords: Stars, double and multiple ; Stars, nearby ; Stars, G-type ;
              Stars, dwarfs
Keywords: binaries: general


Abstract:
    A complete census of wide visual companions to nearby G-dwarf stars
    can be achieved by selecting candidates from the Two Micron All Sky
    Survey (2MASS) Point-Source Catalog and checking their status by
    second-epoch imaging. Such data are obtained for 124 candidates with
    separations up to 20", 47 of which are shown to be new physical
    low-mass stellar companions. A list of visual binaries with G-dwarf
    primaries is produced by combining newly found companions with
    historical data.

Description:
    Simultaneous images in the visible and IR were taken at the CTIO 1.3m
    telescope (the telescope used in 2MASS) with the ANDICAM instrument.

    Observations were carried out in 2010 February-March (2010.09 to
    2010.19).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        67      124   Companion measurements (2010.14)
table2.dat        78      221   Photometry and companion status
table3.dat        80      227   Notes on individual targets


See also:
     I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
    II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     HIP       Hipparcos identification number
   7-  8  A2    ---     Sys       [AB AC AD] Binary pair identification
  10- 14  F5.2  arcsec  2Sep      2MASS separation
  16- 20  F5.1  deg     2PA       2MASS position angle
  22- 26  F5.2  mag     2DKmag    2MASS Ks band magnitude difference
      28  A1    ---     2Q        [A-EU] 2MASS quality flag in the Ks band
  30- 34  F5.2  arcsec  KSep      ANDICAM Ks band separation
  36- 40  F5.1  deg     KPA       ANDICAM Ks band position angle
  42- 46  F5.2  mag     KDKmag    ANDICAM Ks band magnitude difference
      48  A1    ---     n_KDKmag  [S] ANDICAM Ks band primary saturated?
  50- 54  F5.2  arcsec  VSep      ? ANDICAM V band separation
  56- 60  F5.1  deg     VPA       ? ANDICAM V band position angle
  62- 65  F4.2  mag     VDVmag    ? ANDICAM V band magnitude difference
      67  A1    ---     n_VDVmag  [S] ANDICAM V band primary saturated?


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     HIP       Hipparcos identification number
   7- 10  F4.1  mas     plx       Hipparcos parallax
  12- 14  I3    ---     Num       Number of companions within 2.5' from primary
  16- 20  F5.2  mag     Vmag      Primary Hipparcos/Tycho catalog V band magnitude
  22- 25  F4.2  mag     Jmag      Primary 2MASS J band magnitude
  27- 30  F4.2  mag     Kmag      Primary 2MASS Ks band magnitude
  32- 35  F4.2  Msun    M1        Primary target mass
      37  A1    ---     Comp      [BCD] Companion identification
  39- 43  F5.2  arcsec  Sep       2MASS separation
  45- 47  I3    deg     PA        2MASS position angle
  49- 53  F5.2  mag     CVmag     ? Companion V band magnitude; see text
  55- 59  F5.2  mag     CJmag     Companion 2MASS J band magnitude
  61- 65  F5.2  mag     CKmag     Companion 2MASS Ks band magnitude
  67- 70  F4.2  Msun    M2        Companion mass
  72- 73  I02   ---     WA        [00/11] Companion flag (1)
  75- 78  F4.1  ---     O         [-2.0/2.0] Opticity flag, >0 for physical pair (2)

Note (1): The flag W=1 is set if the companion is known (e.g. found in the
     WDS), flag A=1 means that the companion was observed with ANDICAM.
Note (2): -2 and -1 for certain or almost certain optical companions, +1
     and +2 for very likely and certain physical companions.


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     HIP       Hipparcos identification number
   7- 80  A74   ---     Notes     Additional notes


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    24-Jul-2012