Tag Archives: NGC 7009

Very deep spectroscopy of the bright Saturn Nebula NGC 7009 – II. Analysis of the rich optical recombination spectrum

X. Fang (1) & X.-W. Liu (1,2) ((1) Department of Astronomy, School of Physics, Peking University, Beijing 100871, P. R. China; (2) Kavli Institute for Astronomy and Astrophysics at Peking University, Beijing 100871, P. R. China) [Abridged] We present a … Continue reading

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

Xuan FangĀ  (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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