Determining element abundances of [WC]-type Central Stars for probing stellar evolution and nucleosynthesis

H. Todt1, M. Peña2, W.-R. Hamann1, G. Gräfener1

1 Universität Potsdam, Institut für Physik, Astrophysik
2 UNAM, Mexico

[WC]-type CSPNs are hydrogen-deficient Central Stars of Planetary Nebulae showing strong stellar winds and a carbon-rich chemistry. We have analyzed new high-resolution spectra of [WC]-type CSPNs with the Potsdam Wolf-Rayet (PoWR) non-LTE expanding atmosphere models, using upgraded model atoms and atomic data. Previous analyses are repeated on the basis of the current models which account for iron-line blanketing. We especially focus on determining the chemical composition, including some trace elements like nitrogen which are of key importance for understanding the evolutionary origin of the hydrogen-deficient Central Stars.

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