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Title:
Photo-Ionization Modelling of the Multiple Shell Planetary Nebula NGC 2438
Authors:
Armsdorfer, B.; Kimeswenger, S.; Rauch, T.
Publication:
Hvar Observatory Bulletin, vol. 26, no. 1, p. 49-50.
Publication Date:
00/2002
Origin:
HVAR
Keywords:
planetary nebulae, NGC 2438, shells, modelling
Bibliographic Code:
2002HvaOB..26...49A

Abstract

We analyse the effects of various model spectra for hot central stars (CSPN) of evolved planetary nebulae (PNe) on the modelling of the shells of PNe. The multiple shell PN NGC 2438, which has a well modelled CSPN and regularly shaped shells, is presented as an example. We combine central star atmosphere modelling (ranging from blackbody flux to NLTE models with different element coverage, i.e. H-He, H-Ca, and H-Ni composition; Rauch 2002) and nebular shell modelling to obtain self consistent presentations of the nebulae. Using the photo-ionization Code Cloudy90 (Ferland 1996) to model the emitted spectrum of the nebula, we found that especially a blackbody model leads to wrong nebular diagnostics and abundances. The density profile of the different shells was also varied, using results from hydrodynamical simulations (Schönberner & Steffen 2002). This leads to a spatial excitation profile which represents well the observations.

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