The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
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Convection zone in the context of Dredge-up
A dredge-up is any one of several stages in the evolution of some stars. By definition, during a dredge-up, a convection zone extends all the way from the star's surface down to the layers of material that have undergone fusion. Consequently, the fusion products are mixed into the outer layers of the star's atmosphere, where they can be seen in stellar spectra.