Proceedings of the International Astronomical Union


Planetary Nebulae in our Galaxy and Beyond
Contributed Papers

The Fe/Ni ratio in the Ant Nebula Mz 3


Y. Zhang a1 and X.-W. Liu a1
a1 Department of Astronomy, Peking University email: zhangy@bac.pku.edu.cn; liuxw@bac.pku.edu.cn

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Abstract

We have analyzed the [Fe II] and [Ni II] emission lines in the bipolar planetary nebula Mz 3. We find that the [Fe II] and [Ni II] lines arise exclusively from the central regions. Fluorescence excitation in the formation process of these lines is negligible for this low-excitation nebula. From the [Fe II]/[Ni II] ratio, we obtain a higher Fe/Ni abundance ratio than the solar value. The current result provides further supporting evidence for Mz 3 as a symbiotic Mira.


Key Words: ISM: abundances; planetary nebulae: individual: Mz 3.