Journal
ASTRONOMY & ASTROPHYSICS
Volume 375, Issue 1, Pages L9-L13Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010903
Keywords
stars : interiors; rotation; abundances; RGB
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We present a scenario to explain the lithium-rich phase which occurs on the red giant branch at the so-called bump in the luminosity function. The high transport coefficients required to enhance the surface lithium abundance are obtained in the framework of rotation-induced mixing thanks to the impulse of the important nuclear energy released in a lithium burning shell. Under certain conditions a lithium ash is triggered off. The enhanced mass loss rate due to the temporary increase of the stellar luminosity naturally accounts for a dust shell formation.
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