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The observations of carbon isotopic ratios in evolved stars suggest that non standard mixing is acting in low mass stars as they are ascending the red giant branch. We propose a simple consistent mechanism, based on the most recent developments in the description of rotation-induced mixing by Zahn (1992), which simultaneously accounts for the low ^12C/^13C ratios in globular cluster and field Pop II giants and for the lithium abundances in metal-poor giant stars. It also leads to the destruction of ³He produced on the main sequence in low mass stars. This should both naturally account for the recent measurements of ³He/H in galactic HII regions and allow for high values of ³He observed in some planetary nebulae.
C. Charbonnel (Wed,) studied this question.
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