[Fe III] lines in the planetary nebula NGC 2392

Yong Zhang (1), Xuan Fang (2), Xiao-Wei Liu (2,3), Sun Kwok (1)

(1) Department of Physics, The University of Hong Kong, Hong Kong, China. (2) Department of Astronomy, School of Physics, Peking University, Beijing, China. (3) Kavli Institute for Astronomy and Astrophysics at Peking University, Beijing, China.

Eskimo Nebula, NGC 2392, is a young double-shell planetary nebula (PN). Its intrinsic structure and shaping mechanism are still not fully understood. We present new optical spectroscopy of NGC 2392. The slit was placed 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 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.

Poster presented at the IAU Symposium 283, Planetary Nebulae: an Eye to the Future, 25-29 July 2011, Tenerife, Spain.

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