Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula

Details Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvl..89b1101b&link_type=abstract

Physical Review Letters, vol. 89, Issue 28, id. 281101

Physics

33

Atomic And Molecular Data, Spectra, And Spectral Parameters, Planetary Nebulae

Scientific paper

Observations of the planetary nebula NGC3918 made with the STIS instrument on the Hubble Space Telescope reveal the first unambiguous detection of a hyperfine-induced transition 2s2p 3Po0→2s2 1S0 in the berylliumlike emission line spectrum of N IV at 1487.89Å. A nebular model allows us to confirm a transition rate of 4×10-4 sec(-1±33% for this line. The measurement represents the first independent confirmation of the transition rate of hyperfine-induced lines in low ionization stages, and it provides support for the techniques used to compute these transitions for the determination of very low densities and isotope ratios.

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