ar X iv : a st ro - p h / 04 04 42 9 v 1 2 1 A pr 2 00 4 On the O ii ground configuration energy levels
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چکیده
The most accurate way to measure the energy levels for the O ii 2p 3 ground configuration has been from the forbidden lines in planetary nebulae. We present an analysis of modern planetary nebula data that nicely constrain the splitting within the 2 D term and the separation of this term from the ground 4 S 3/2 level. We extend this method to H ii regions using high-resolution spectroscopy of the Orion nebula, covering all six visible transitions within the ground configuration. These data confirm the splitting of the 2 D term while additionally constraining the splitting of the 2 P term. The energies of the 2 P and 2 D terms relative to the ground (4 S) term are constrained by requiring that all six lines give the same radial velocity, consistent with independent limits placed on the motion of the O + gas and the planetary nebula data.
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تاریخ انتشار 2004