Photo-ionization modelling of planetary nebulae
II. Galactic bulge nebulae, a comparison with literature results
P.A.M. van Hoof, G.C. Van de Steene
published in: MNRAS 308, 623 (1999)
We have constructed photo-ionization models of five galactic bulge planetary
nebulae using our automatic method which enables a fully self-consistent
determination of the physical parameters of a planetary nebula. The models
are constrained using the spectrum, the IRAS and radio fluxes and the
angular diameter of the nebula. We also conducted a literature search for
physical parameters determined with classical methods for these nebulae.
Comparison of the distance independent physical parameters with
published data shows that the stellar temperatures generally are in
good agreement and can be considered reliable. The literature data for
the electron temperature, electron density and also for the abundances
show a large spread, indicating that the use of line diagnostics is
not reliable and that the accuracy of these methods needs to be
improved. Comparison of the various abundance determinations indicates
that the uncertainty in the electron temperature is the main source of
uncertainty in the abundance determination. The stellar magnitudes
predicted by the photo-ionization models are in good agreement with
observed values.
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Peter van Hoof
Royal Observatory of Belgium
Ringlaan 3
1180 Brussel
Belgium
email: p DOT vanhoof AT oma DOT be
