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What Nebular Observations and Photoionization Models Can Tell us about Atmospheres of Hot Stars
Highlights of Astronomy
Work on A supergiants is now underway opening up the prospect of spectroscopic distance determinations over cosmologically significant ranges with the coming generation of 8 m ground-based telescopes. In constructing the model atoms and calculating the atomic data needed, it soon becomes apparent that one of the most serious deficiencies is the small number of energy levels and wavelengths available for many of the iron group ions. These are important for spectral synthesis. Moderately accuratedoi:10.1017/s153929960001217x fatcat:kzs6t2j65ndxhcy4pdokkso444