Hyperfine splitting of [ Al VI ] 3 . 66 μ m and the Al isotopic ratio in NGC 6302

Abstract

The core of planetary nebula NGC 6302 is filled with high-excitation photoionised gas at low expansion velocities. It represents a unique astrophysical situation in which to search for hyperfine structure (HFS) in coronal emission lines from highly ionised species. HFS is otherwise blended by thermal or velocity broadening. Spectra containing [Al VI] 3.66μm… (More)

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