Non-Lte Diagnostic Stellar Spectroscopy. II. on the Schuster Mechanism for the Production of Emission Lines

We investigate the conditions under which the Schuster mechanism can produce emission lines. We consider Schuster's original formulation, together with Mime's modification and a general non-LTE formulation. We conclude that while emission lines may result in particular circumstances, it is unlikely that observations of bright lines can be interpreted by this mechanism