SIMBAD references

2004ApJ...610..813B - Astrophys. J., 610, 813-819 (2004/August-1)

On the O II ground configuration energy levels.


Abstract (from CDS):

The most accurate way to measure the energy levels for the O II 2p3 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 2D term and the separation of this term from the ground 4S3/2level. 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 2D term while additionally constraining the splitting of the 2P term. The energies of the 2P and 2D terms relative to the ground (4S) 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.

Abstract Copyright:

Journal keyword(s): Atomic Data - ISM: Individual: Name: Orion Nebula - Methods: Data Analysis - ISM: Planetary Nebulae: General - Techniques: Spectroscopic

Simbad objects: 25

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