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J/AJ/124/1118 Radial velocities of high-velocity white dwarfs (Silvestri+, 2002)
Wide binary systems and the nature of high-velocity white dwarfs.
    Silvestri N.M., Oswalt T.D., Hawley S.L.
   <Astron. J. 124, 1118 (2002)>
   =2002AJ....124.1118S
ADC_Keywords: Stars, double and multiple ; Stars, white dwarf ;
              Radial velocities
Keywords: binaries: general - Galaxy: disk - Galaxy: kinematics and dynamics -
          stars: fundamental parameters - white dwarfs

Description:
    Radial velocities and complete space motions were measured for 116
    white dwarf stars with M dwarf companions (WD+M), including thirteen
    pairs having "halo-like" velocities. These 116 WD+dM binaries were
    observed on the 3.5 m telescope at the Apache Point Observatory (APO)
    on nearly 30 half-nights between 2000 September 4 and 2001 October 20.
    The APO Double Imaging Spectrograph was used with a 15" slit, yielding
    a resolution of approximately 2arcsrc/pixel.

    From the near-solar abundance levels of the M dwarf companions, only
    one potential stellar halo white dwarf (LP 164-52) was found in the
    sample, 12 of the 13 high-velocity white dwarfs being actually part of
    the high-velocity tail of the thick disk rather than the dark matter
    halo of the Galaxy.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        60      116   116 White Dwarfs in Common Proper Motion
                              Binary Systems


See also:


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


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

   Bytes Format Units   Label     Explanations

   1-  9  A9    ---     ID        White dwarf identifier assigned by Luyten
      11  A1    ---     f_ID      [b] Note on ID (1)
  13- 19  F7.4  h       RAh       Hour of Right Ascension (B1950)
  21- 28  F8.4  deg     DEdeg     Declination expressed in decimal degrees (B1950)
  30- 33  F4.2 arcsec/yr mu       Total proper motion
  35- 37  I3    deg     PAmu      Position angle of the total proper motion
  39- 43  F5.1  km/s    RV        Measured radial velocity
  45- 48  F4.1  km/s    e_RV      Error in RV
  50- 54  F5.2  mag     Vmag      The V band magnitude from Smith
                                 (1997, Ph.D. thesis, Florida Inst. Technol)
  56- 59  F4.1  mag     VMag      Absolute V band magnitude (2)

Note (1): b: A stellar halo white dwarf candidate.

Note (2): Determined from the atmosphere models of Bergeron, Saumon & Wesemael
          (1995ApJ...443..764B) assuming a log(g)=8.0 WD.


History:
    From electronic version of the journal
(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    26-Nov-2002