- Conference date: 28 June-2 July 2005
- Location: Gdansk (Poland)
Spectra of [Al VI] 3.66 μm 3P2 ←3P1 in the coronal region of PN NGC 6302, obtained with Phoenix on Gemini‐South at resolving powers of up to 75000, resolve the line into five hyperfine components separated by 20 to 60 km s−1 due to the coupling of the I = 5/2 nuclear spin of 27Al with the total electronic angular momentum J. 26Al has a different nuclear spin of I = 5, and a different hyperfine structure (HFS), which allows us to place a 3 σ upper limit on the 26Al/27Al ratio of 1/33. We measure the HFS magnetic‐dipole coupling constants for [Al VI], and provide the first observational estimates of atomic electric‐quadrupole HFS coupling constants.
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