Abstract
The A-type supergiants occupy an interesting region on the HR-diagram, where theories of the evolution of 10–20 solar mass stars differ. The differences between the scenarios depend on the input assumptions for several physical parameters, e.g., treatments for convection parameters and mass loss rates. A review of the predictions of evolution calculations for 10–30 solar mass stars is given by Fitzpatrick & Garmany (1991).
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