[Fe iii] lines in the planetary nebula NGC 2392

• Published in: Proceedings of the International Astronomical Union
• Main Authors: Fang, X, Hsia, CH, Liu, XW, Chau, WC, Kwok, S, Zhang, Y
• Format: Conference Object
• Language: English
• Published: Cambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=IAU 2011
• Subjects: line: identification; planetary nebulae: individual (NGC 2392; Mz 3); eskimo*
• Online Access: https://doi.org/10.1017/S1743921312012288; http://hdl.handle.net/10722/165696

The Eskimo Nebula (NGC 2392) is a young double-shell planetary nebula (PN). Its intrinsic structure and the responsible shaping mechanism are still not fully understood. We present new optical spectroscopy of NGC 2392 at two different locations to obtain the spectra of the inner and outer shells. Several [Fe iii] lines are clearly detected. We find that these [Fe iii] lines mostly originate from the inner shell. Therefore, we suggest that NGC 2392 might have an intrinsic structure similar to the Ant Nebula Mz 3, which exhibits a number of [Fe iii] lines from the central dense regions. In this scenario, the inner and outer shells correspond to the central emission core and the outer lobes of Mz 3, respectively. © 2012 International Astronomical Union. published_or_final_version