Access to Astronomical Catalogues

J/ApJS/156/47    DA white dwarfs from the Palomar Green Survey  (Liebert+, 2005)
The formation rate and mass and luminosity functions of DA white dwarfs from
the Palomar Green survey.
    Liebert J., Bergeron P., Holberg J.B.
   <Astrophys. J. Suppl. Ser., 156, 47-68 (2005)>
   =2005ApJS..156...47L
ADC_Keywords: Stars, white dwarf ; Stars, masses ; Effective temperatures

Keywords: stars: fundamental parameters -
                 stars: luminosity function, mass function - white dwarfs

Abstract:
    Spectrophotometric observations at high signal-to-noise ratio were
    obtained of a complete sample of 347 DA white dwarfs from the Palomar
    Green (PG) Survey (1986, Cat. II/207). Fits of observed Balmer lines
    to synthetic spectra calculated from pure-hydrogen model atmospheres
    were used to obtain robust values of Teff, log(g), masses, radii,
    and cooling ages. The luminosity function of the sample, weighted by
    1/Vmax, was obtained and compared with other determinations.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        95      347   Atmospheric parameters of DA stars from the
                             complete PG sample


See also:
  II/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)
  J/ApJS/133/413  : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
  J/ApJ/607/426   : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
  J/MNRAS/335/673 : DA white dwarfs in 2dF QSO Redshift Survey (Vennes+, 2002)


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

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     PG        The Palomar Green Survey identification
  10- 19  A10   ---     Name      Other common object name
  21- 26  I6    K       Teff      Effective temperature
  28- 32  I5    K       e_Teff    Formal uncertainty in Teff
  34- 37  F4.2  [cm/s2] log(g)    Log of the surface gravity
  39- 42  F4.2  [cm/s2] e_log(g)  Formal uncertainty in log(g)
  44- 47  F4.2  solMass Mass      Stellar mass in solar units
  49- 52  F4.2  solMass e_Mass    Uncertainty in Mass
  54- 58  F5.2  mag     VMAG      Absolute visual magnitude
  60- 64  F5.2 [solLum] logL      Log of the luminosity in solar units
  66- 71  F6.3  mag     Vmag      Apparent V band magnitude
  73- 76  I4    pc      Dist      Heliocentric Distance
  78- 84  E7.3  pc-3    1/Vmax    Stellar contribution to the local space density
  86- 89  F4.2  [yr]    logtau    Log of the cooling time
  91- 94  A4    ---     n_PG      Additional notes on PG (1)

Note (1): Additional notes on PG, defined as follows:
    1 = Binary;
    2 = V magnitude derived from Bph;
    3 = DAO star, Teff and log(g) from Bergeron et al. (1994ApJ...432..305B);
    4 = Misclassified in the PG catalog;
    5 = V magnitude derived from g and r Sloan Digital Sky Survey
         (Cat. J/AJ/126/2579);
    6 = ZZ Ceti star;
    7 = Double degenerate;
    8 = DA + magnetic DB, Teff and log(g) from Liebert et al.
         (1993ApJ...418..426L);
    9 = Planetary nebula nucleus;
   10 = Magnetic, Teff and log(g) from Schmidt et al. (1986ApJ...309..218S);
   11 = Magnetic, Teff and log(g) from Bergeron & Liebert
         (2002ApJ...566.1091B);
   12 = Magnetic, Teff and log(g) from Liebert et al. (2003AJ....125..348L);
   13 = Double degenerate?;
   14 = Magnetic;
   15 = Magnetic, Teff and log(g) from Liebert et al. (1985PASP...97..158L);
   16 = Magnetic, Teff and log(g) from Schmidt et al. (1992ApJ...394..603S);
   17 = Not in McCook & Sion (1999, Cat. III/235).


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    18-May-2005