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Lithium and the s-PROCESS in Red-Giant Stars
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1971
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Helium‑burning shell flashes in advanced red‑giant stars can trigger complete convection of the outer envelope down to the helium‑burning shell. The resulting mixing converts envelope 3He into 7Be, which decays to 7Li, allowing lithium to remain near the surface and explain the high lithium abundances seen in some S and carbon red‑giant stars. When hydrogen mixing is modest during the initial phase, the s‑process produces large amounts of heavy elements, and the 7Li/6Li ratio in these stars should exceed 100. Published in The Astrophysical Journal, February 1971 (DOI 10.1086/150821).
view Abstract Citations (597) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lithium and the s-PROCESS in Red-Giant Stars Cameron, A. G. W. ; Fowler, W. A. Abstract Some consequences are discussed of the possibility that helium-burning shell flashes in advanced stages of stellar evolution occasionally induce complete convection of the outer envelope down to the helium-burning shell. If the hydrogen mixing is relatively small for the first t0 seconds the result may be the production of large amounts of heavy elements by the s-process. When complete mixing commences, the 3He in the envelope will he converted to 7Be, and the subsequent delayed electron capture to form 7Li may allow enough lithium to remain near the surface to account for the very large lithium abundances in some S and carbon red-giant stars. On this basis the 7Li/6Li ratio in these stars should be quite large (>100). Publication: The Astrophysical Journal Pub Date: February 1971 DOI: 10.1086/150821 Bibcode: 1971ApJ...164..111C full text sources ADS | data products SIMBAD (5)