mass loss, and the stars become heavily obscured at visual wavelengths. These stars can be observed as OH/IR stars, pulsating in the infrared and showing OH maser activity. These stars are clearly oxygen rich, in contrast to the carbon stars, but both must be produced by dredge ups.

Post-AGB

thumbThese mid-range stars ultimately reach the tip of the asymptotic-giant-branch and run out of fuel for shell burning.

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