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J/ApJS/98/659               Galactic PNe statistical distance scale (Zhang 1995)
A statistical distance scale for galactic planetary nebulae
       Zhang C.Y.
      <Astrophys. J. Suppl. Ser. 98, 659 (1995)>
      =1995ApJS...98..659Z
ADC_Keywords: Planetary nebulae ; Stars, distances

Keywords: distance scale - planetary nebulae: general


Description:
    A statistical distance scale is proposed. It is based on the
    correlation between the ionized mass and the radius and the
    correlation between the radio continuum surface brightness temperature
    and the nebular radius. The proposed statistical distance scale is an
    average of the two distances obtained using the correlations. These
    correlations, calibrated on the 132 planetary nebulae with
    well-determined individual distances by Zhang, can reproduce not only
    the average distance of a sample of Galactic Bulge planetary nebulae
    exactly at the distance to the Galactic center, but also the expected
    gaussian distribution of their distances around the Galactic center.
    This new distance scale is applied to 647 Galactic planetary nebulae.
    It is estimated that this distance scale can be accurate on average to
    35%-50%. Our statistical distance scale is in good agreement with the
    one recently proposed by Van de Steene and Zijlstra

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1            78      134   Planetary nebulae with individually determined
                                  distances
table1.tex       113      159   LaTeX version of table1
table3            72      647   Catalog of statistical distances of planetary
                                  nebulae
table3.tex       100      675   LaTeX version of table3


See also:
    V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+ 1992)


Byte-by-byte Description of file: table1

   Bytes Format Units   Label    Explanations

   1-  7  A7    ---     Name     Common name
   9- 16  A8    ---     PK       Perek & Kohoutek name
  18- 22  F5.2  kpc     Dist     Individually determined distance
  24- 27  I4    mJy     S5GHz    5 GHz (6 cm) radio flux density
  29- 33  F5.1  arcsec  Diam     Diameter of nebula
  35- 41  F7.2  K       Tb       Radio Brightness Temperature
  43- 47  F5.3  pc      Rad      Radius of nebula
  49- 54  E6.1  solMass Mi       Ionized gas mass of nebula
  56- 60  F5.2  kpc     DMi      Statistical distance derived from
                                  mass-radius relation
  62- 66  F5.2  kpc     DTb      Statistical distance from Tb - R relation
  68- 72  F5.2  kpc     Df       Mean of DMi and DTb adopted as final result (1)
  74- 78  F5.1  %       Delta    ? Fractional difference between Df and Dist

Note (1): In Table 1 of the paper, Dm should read Df.



Byte-by-byte Description of file: table3

   Bytes Format Units   Label     Explanations

   1-  9  A9    ---     Name      Common name
  11- 18  A8    ---     PK        PK name
  19- 24  F6.1  mJy     S5GHz     5 GHz (6 cm) radio flux density
  26- 30  F5.1  arcsec  Diam      Diameter of nebula in arcsec
  32- 34  I3    ---     Ref       References for the previous columns (1)
  36- 42  F7.2  K       Tb        Radio Brightness Temperature
  44- 48  F5.2  kpc     DMi       Statistical distance derived from
                                mass-radius relation
  50- 54  F5.2  kpc     DTb       Statistical distance from Tb - R relation
  56- 60  F5.2  kpc     Df        Mean of DMi and DTb adopted as final result (2)
  62- 66  F5.2  kpc     D(VSZ)    ? Distance from Van de Steene and Zijstra (1995)
  68- 72  F5.2  kpc     D(CKS)    ? Distance from Cahn, Kaler & Stanghellini (1992)

Note (1): Reference numbers are:
       1: Pottasch (1994A&A...289..261P)
       2: Aaquist & Kwok (1990A&AS...84..229A)
       3: Zijlstra et al. (1989A&AS...79..329Z)
       4: Milne & Aller (1975A&A....38..183M)
       5: Milne (1979A&AS...36..227M)
       6: Roelfsema et al. (1991A&A...251..611R)
       7: Cahn et al. (1992A&AS...94..399C)
       8: Pottasch & Zijlstra (1994A&A...289..261P)
Note (2): In Table 3 of the paper, Dm should read Df.



Acknowledgements: 


References:
   Aaquist & Kwok, 1990 A&AS 84, 229              =1990A&AS...84..229A
   Cahn et al., 1992 A&AS 94, 399                 =1992A&AS...94..399C
   Milne, 1979 A&AS 36, 227                       =1979A&AS...36..227M
   Milne & Aller, 1975 A&A 38, 183                =1975A&A....38..183M
   Pottasch, 1984 Planetary nebulae (Dordrecht: Reidel)
   Pottasch & Zijlstra, 1994 A&A 289, 261         =1994A&A...289..261P
   Roelfsema et al., 1991 A&A 251, 611            =1991A&A...251..611R
   Van de Steene and Zijlstra, 1994,              =1994A&AS..108..485V
   Van de Steene and Zijlstra, 1995, A&A 293, 541 =1995A&A...293..541V
   Zijlstra et al., 1989 A&AS 79, 329             =1989A&AS...79..329Z
(End)                                         Patricia Bauer  [CDS]  28-Aug-1996