Observations of Raman-scattered He II lines in RR Telescopii reveal distinct velocities tracing different H I depths and temporal declines in conversion efficiency, implying the neutral region needs complex radiative transfer models beyond a single column density.
NGC 6302: The Tempestuous Life of a Butterfly
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The review identifies and discusses key unsolved problems in planetary nebulae such as 3D morphology, multipolar origins, dust distribution, binarity, and the abundance discrepancy, along with suggested future directions.
citing papers explorer
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High-Resolution Spectroscopy of Raman-scattered He II Lines in the Symbiotic Nova RR Telescopii
Observations of Raman-scattered He II lines in RR Telescopii reveal distinct velocities tracing different H I depths and temporal declines in conversion efficiency, implying the neutral region needs complex radiative transfer models beyond a single column density.
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Current Unsolved Problems in Planetary Nebulae Research
The review identifies and discusses key unsolved problems in planetary nebulae such as 3D morphology, multipolar origins, dust distribution, binarity, and the abundance discrepancy, along with suggested future directions.