Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-16
Astron.Astrophys. 413 (2004) 329-342
Astronomy and Astrophysics
Astrophysics
16 pages, 10 figures, Astronomy and Astrophysics in press
Scientific paper
10.1051/0004-6361:20034072
We present a comprehensive study of the Magellanic Cloud planetary nebula SMP 61 and of its nucleus, a Wolf-Rayet type star classified [WC 5-6]. We have performed a detailed spectral analysis of the central star, using the Potsdam code for expanding atmospheres in non-LTE. The fluxes from the model stellar atmosphere were used to compute photoionization models of the nebula. All the available observations, within their error bars, were used to constrain these models. We find that the ionizing fluxes predicted by the stellar model are basically consistent with the fluxes needed by the photoionization model to reproduce the nebular emission, within the error margins. However, there are indications that the stellar model overestimates the number and hardness of Lyman continuum photons. The photoionization models imply a clumped density structure of the nebular material. The observed CIII] 1909/CII 4267 line ratio implies the existence of carbon-rich clumps in the nebula. Such clumps are likely produced by stellar wind ejecta, possibly mixed with the nebular material. We discuss our results with regard to the stellar and nebular post-AGB evolution.
Gräfener Goetz
Hamann Wolf-Rainer
Koesterke Lars
Peña Manuel
Stasinska Grazina
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