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J/A+AS/126/297      PN abundances (Ratag+ 1997)
Abundances in planetary nebulae near the galactic centre.
I. Abundance determinations
       Ratag M.A., Pottach S.R., Dennefeld M., Menzies J.
      <Astron. Astrophys. Suppl. Ser. 126, 297 (1997)>
      =1997A&AS..126..297R      (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Abundances

Keywords: planetary nebulae - ISM: abundances - Galaxy: center


Abstract:
    Abundance determinations of about 110 planetary nebulae, which are
    likely to be in the Galactic Bulge are presented. Plasma diagnostics
    have been performed by making use of the available forbidden line
    ratios combined with radio continuum measurements. Chemical abundances
    of He, O, N, Ne, S, Ar, and Cl are then derived by employing
    theoretical nebular models as interpolation devices in establishing
    the ionization correction factors (ICFs) used to estimate the
    distribution of atoms among unobserved ionization stages. The overall
    agreement between the results derived by using the model-ICFs and
    those obtained from the theoretical models is reasonably good. The
    uncertainties related to the total abundances show a clear dependence
    on the level of excitation. In most cases, the abundances of chlorine
    can be derived only in objects with a relatively high Cl-abundance.
    Contrary to the conclusion previously drawn by Webster
    (1988MNRAS.230..377W), we found the excitation classes are not
    uniformly distributed. A clear peak at about classes 5 and 6 is
    noticed. The distribution is shifted toward a lower excitation range
    with respect to that of the nearby nebulae, reflecting the difference
    in the central star temperature distribution between the two samples.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
pos2000           46       46   Planetary nebulae J2000 positions
table1            38     1135   Line Intensities corrected for interstellar
                                  extinction
table2a          117       45   Fundamental data of the newly observed objects
table2b          117       52   Fundamental data of the objects with published
                                  spectra
table5            85       95   Adopted abundances for the nebulae
table6            85        8   Abundances from the literature


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


Byte-by-byte Description of file: pos2000

   Bytes Format Units   Label     Explanations

   1-  2  A2    ---     ---       [PK]
   4- 11  A8    ---     PK        PK name
  13- 14  I2    h       RAh       Right ascension (J2000)
  16- 17  I2    min     RAm       Right ascension (J2000)
  19- 22  F4.1  s       RAs       Right ascension (J2000)
      24  A1    ---     DE-       Declination sign
  25- 26  I2    deg     DEd       Declination (J2000)
  28- 29  I2    arcmin  DEm       Declination (J2000)
  31- 32  I2    arcsec  DEs       Declination (J2000)
  35- 45  A11   ---     Name      PK name in Simbad


Byte-by-byte Description of file: table1

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     PK        Planetary nebula name
  10- 13  I4    ---     Lambda    Wavelength
  15- 26  A12   ---     Ident     Wavelength identification
      29  A1    ---     l_Int     Limit lfag on Int
  30- 36  F7.2  ---     Int       ? Line intensity (2)
  37- 38  A2    ---     u_Int     [*:? b] Note (1)

Note (1): ':' Uncertainty flag
          '?' Line not observed
          '*' Saturated line
          'b' Blended with the preceding or next line
Note (2): Additional and adopted line intensities: Line intensities of the
 wavelengths marked with "w" are adopted from Webster (1988MNRAS.230..377W),
 while those with "a" from Aller and Keyes (1987ApJS...65..405A).
  0-2.3   5007w, 5755w
  0+3.1   4712w, 4740w
  1-3.1   5007w, 6300w, 5698=1.04
  2-6.1   6300a
  2-4.2   4648=3.8, 5150=0.53, 5412=1.68, 5665+5680=2.6, 7236=1.36 ([ArIV], CII)
  2-4.1   9069=18.0, 9532=48.0
  2-3.5   3868a, 4471a
  2-3.3   4415=1.1; 4553=1.52; 4570=1.62; 4681=3.9, 5698=2.8;
           Central star is probably a Wolf-Rayet.
  2-2.4   5517a, 5537a
  3-4.9   5412=2.2, 7236=1.1 ([ArIV],CII)
  3-4.4   4648=3.8, 5412=4.2
  4-22.1  Sum 4640-4648=7.4
  6+4.2   5810=28.6 (broad)
  6+8.1   4570=0.74; 7236=0.26 ([ArIV],CII)
  7-4.1   3727a, 3968a, 5698=1.65
  12-2.1  5698=1.37
  349+4.1 4415=5.6
  351+5.1 7236=0.77: ([ArIVl,CII)
  353+6.2 6300a
  355-6.1 5412=0.52
  355-4.2 5517w, 5537w, 7236=0.7: ([ArIV],CII)
  355-2.3 3425=87.1. Peculiar, if this is originated from [NeV], since no HeII
           line is detected.
  357-7.1 4640w, 4686w
  358+1.1 4686w, 4712w, 5755w
  359-4.2 3425=251 (see remarks for PK 355-2.3)
  359-2.3 5412=1.37
  359-1.2 5876w
  359-1.1 5412=3.1, 7012=1.70, sum (5517+5537)w
  3-4.3   3727a, 4471a, 5876a, 6678a, 6717a, 6731a
  3+3.1   5696=1.86:
  4+6.2   7080=1.02
  357+4.1 Sum (6717 +6731)w
  359-2.4 4712w, 5200w, 6312w, 7325w
  359+3.4 5412=7.8, 7005=6.0


Byte-by-byte Description of file: table2a table2b

   Bytes Format Units      Label       Explanations

   1-  8  A8    ---        PK          PK number
  10- 17  A8    ---        Name        Planetary nebula name
  19- 22  A4    ---        Class       Exc. class
      24  A1    ---        l_S6cm      Limit flag on S6cm
  25- 28  F4.1  mJy        S6cm        ? Flux density at 6cm
      29  A1    ---        u_S6cm      Uncertainty flag on S6cm
  30- 35  F6.2  [mW/m2]   logF(Hbeta)  ? Hβ flux
      36  A1    ---     u_logF(Hbeta)  Uncertainty flag on logF(Hbeta)
      37  A1    ---        l_Diam      Limit flag on Diam
  38- 42  F5.2  arcsec     Diam        ? Diameter
  44- 47  F4.2  mag        E(B-V)B     ? Extinction E(B-V) from Balmer line
  49- 52  F4.2  mag        E(B-V)r     ? Extinction E(B-V) from radio/Hβ
      53  A1    ---        u_E(B-V)r   Uncertainty flag on E(B-V)r
  55- 58  F4.2  10+4K      Te[OIII]    ? Electron temperature from [OIII]
  60- 63  F4.2  10+4K      Te[NII]     ? Electron temperature from [NII]
      64  A1    ---        u_Te[NII]   Uncertainty flag on Te[NII]
  66- 69  F4.2  10+4K      Te          ? Average electron temperature
      70  A1    ---        u_Te        Uncertainty flag on Te
  72- 76  F5.2  10+3cm-3   Ne          ? Electron density
  78- 83  F6.1  km/s       Vlsr        ? LSR velocity
  85- 89  F5.2  10+7m-1   Fl/F(Hbeta)  ? Flambda(5325A)/F(Hβ) ratio
  91- 95  F5.2  10-13W/m2  FIR         ? Total IR flux
  97-101  F5.2  ---        IRE         ? IR excess
 103-117  A15   ---        Ref         References (1)

Note (1):  A: Acker et al. (1989A&AS...80..201A)
          A2: Acker et al. (1989A&AS...77..487A)
          AK: Aaquist and Kwok (1990A&AS...84..229A)
         AK1: Aller and Keyes (1987ApJS...65..405A)
          AL: Allen (1979Obs....99...83A)
           G: Gathier et al. (1983A&A...128..325G)
         KFL: Kinman et al. (1988AJ.....95..804K)
          MA: Milne and Aller (1975A&A....38..183M, 1982A&AS...50..209M)
           P: Pottasch et al. (1988A&A...205..248P)
          PK: Perek and Kohoutek (1967PKCat.C......1P)
           R: Ratag et al. (1990A&A...233..181R)
           S: Schneider et al. (1983ApJS...52..399S)
          SK: Shaw and Kaler (1989ApJS...69..495S)
           W: Webster (1988MNRAS.230..377W)
         W83: Webster (1983PASP...95..610W)
           Z: Zilstra et al. (1989IAUS..131..210Z)


Byte-by-byte Description of file: table5 table6

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     PK        PK name
  10- 16  A7    ---     Name      Other name
  18- 22  F5.2  [Sun]   [He]      Adopted He abundance
  23- 24  A2    ---     n_[He]    Note on [He]
  26- 29  F4.2  [Sun]   [O]       Adopted O abundance
  30- 31  A2    ---     n_[O]     Note on [O]
  33- 36  F4.2  [Sun]   [N]       ? Adopted N abundance
  37- 38  A2    ---     n_[N]     Note on [N]
  40- 43  F4.2  [Sun]   [Ne]      ? Adopted Ne abundance
  44- 45  A2    ---     n_[Ne]    Note on [Ne]
  47- 50  F4.2  [Sun]   [S]       ? Adopted S abundance
  51- 52  A2    ---     n_[S]     Note on [S]
  54- 57  F4.2  [Sun]   [Ar]      ? Adopted Ar abundance
  58- 59  A2    ---     n_[Ar]    Note on [Ar]
      60  A1    ---     u_[Ar]    Uncertainty flag on [Ar]
  61- 64  F4.2  [Sun]   [Cl]      ? Adopted Cl abundance
  65- 66  A2    ---     n_[Cl]    Note on [Cl]
  68- 72  F5.1  10+3K   Teff      Effective temperature
  74- 77  F4.2  [cm/s2] logg      ? Surface gravity
  79- 85  A7    ---     Notes     Notes (1)

Note (1): (1) Kurucz (1979ApJS...40....1K)
          (2) Clegg and Middlemass (1987MNRAS.228..759C)
          (3) Husfeld et al. (1984A&A...134..139H)
          (4) Planckian distribution.
          (5) The derived electron temperature, Te, is uncertain.
          (6) The electron density, Ne is derived from [ArIV] doublet.
          (7) The adopted electron density is uncertain.
          (8) The faintness, due to the very large interstellar extinction
                and/or due to the intrinsically low surface brightness of the
                nebula, causes the line intensities blueward of Hβ to be
                poorly determined.
          (9) The observed line intensity ratio of
               [OII]λ3727/λ3725 cannot be reproduced by the model.
               The line intensity at λ7325 predicted by the model is much
               lower than the observed one. Dielectronic recombination may play
               an important role (Rubin, 1986ApJ...309..334R).


History: Prepared via OCR at CDS.

(End)                                         Patricia Bauer [CDS]   14-Oct-1997