85 citations · 229 across the 6 of their papers we have counts for
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astro-ph2005★ 85 cited
Integrated spectrum of the planetary nebula NGC 7027
Y. Zhang, X. -W. Liu, S. -G. Luo +2
We present deep optical spectra of the archetypal young planetary nebula (PN) NGC 7027, covering a wavelength range from 3310 to 9160 A. The observations were carried out by unifor…
astro-ph2005★ 64 cited
Helium recombination spectra as temperature diagnostics for planetary nebulae
Y. Zhang, X. -W. Liu, Y. Liu +1
Electron temperatures derived from the \ion{He}{1} recombination line ratios, designated (\ion{He}{1}), are presented for 48 planetary nebulae (PNe). We study the effect…