Lithium destruction and production observed in red giant stars

S.Uttenthaler (1), T. Lebzelter (1), M. Busso (2), S. Palmerini (3,4), B.Aringer (1), and M. Schultheis (5) ((1) University of Vienna, Department of Astrophysics, Türkenschanzstraße 17, 1180 Vienna, Austria; (2) Dipartimento di Fisica, Universitá di Perugia, and INFN, Sezione di Perugia. Via Pascoli, 06123 Perugia, Italy; (3) Centro Siciliano di Fisica Nucleare e Struttura dalla Materia, Viale A. Doria, 6 – 95125
Catania, Italy; (4) Laboratori Nazionali del Sud I.N.F.N., via S. Sofia 62, Catania, Italy; (5) Institut Utinam, CNRS UMR6213, OSU THETA, Université de Franche-Comté, 41bis
avenue de l’Observatoire, 25000 Besanc¸on, France)

According to standard stellar evolution, lithium is destroyed throughout most of the evolution of low- to intermediate-mass stars. However, a number of evolved stars on the red giant branch (RGB) and the asymptotic giant branch (AGB) are known to contain a considerable amount of Li, whose origin is not always understood well. Here we present the latest development on the observational side to obtain a better understanding of Li-rich K giants (RGB), moderately Li-rich low-mass stars on the AGB, as well as very Li-rich intermediate-mass AGB stars possibly undergoing the standard hot bottom burning phase. These last ones probably also enrich the interstellar medium with freshly produced Li.

Complete preprint ==> http://arxiv.org/abs/1206.2759

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