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(stellar convection bringing up fused material)

The term dredge-up, in stellar evolution, refers to the movement of fused material in/near the stellar core to the outer portion or surface of the star through convection. This occurs during some phases of stellar evolution, the events referred to as dredge-ups. The dredged-up material and the reduction of displaced material can sometimes be discerned in the spectrum of the star. Such dredge-up events occur in stars more massive than red dwarves, that enter the red-giant branch (RGB). Current stellar models presume three occurrences in "normal", sufficiently-massive stars:

(stars,event type,stellar evolution)
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