Tag Archives: planetary nebula

Very deep spectroscopy of planetary nebula NGC 7009 – The rich optical recombination spectrum and new effective recombination coefficients

Xuan Fang  (Department of Astronomy, School of Physics, Peking University, China) New ab-initio calculations of the effective recombination coefficients for the N II and O II recombination spectrum were carried out in the intermediate coupling scheme by Fang, Storey & … Continue reading

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[Fe III] emission lines in the planetary nebula NGC 2392

Y. Zhang (1), X. Fang (2), W. Chau (1), C.-H. Hsia (1), X.-W. Liu (2,3), S. Kwok (1), and N. Koning (4) ((1)Department of Physics, The University of Hong Kong, Hong Kong; (2) Department of Astronomy, Peking University, Beijing 100871, … Continue reading

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Reduce, Reuse, Recycle: PNe as green galactic citizens

Karen Kwitter (Williams College, USA) We review gas-phase abundances in PNe, and describe their dual utility as archives of original progenitor metallicity via the alpha elements, as well as sources of processed material from nucleosynthesis during the star’s evolution, i.e., … Continue reading

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Atomic data requisites from IAU Symposium 283

Puerto de la Cruz (Tenerife, Spain) has hosted a Symposium of the International Astronomical Union on Planetary Nebulae (IAUS 283 Planetary Nebulae: an Eye to the Future; 25-29 July 2011).    

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[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 … Continue reading

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