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A new radio molecular line survey of planetary nebulae - HNC/HCN as a diagnostic of ultraviolet irradiation
Certain planetary nebulae (PNe) contain shells, filaments, or globules of cold gas and dust whose heating and chemistry are likely driven by UV and X-ray emission from their central stars and from wind-collision-generated shocks. We present the results of a survey of molecular line emission in the 88–236 GHz range …