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19952016
most citedLocally Optimally Emitting Clouds and the Origin of Quasar Emission Lines

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astro-ph2004★ 30 cited

Identification and Characterization of Faint Emission Lines in the Spectrum of the Planetary Nebula IC 418

Brian Sharpee, Jack A. Baldwin, Robert Williams

We present high signal-to-noise echelle spectra of the compact high surface brightness, low ionization planetary nebula IC 418. These reveal 807 emission lines down to intensities…