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Population II Li-6 as a probe of nucleosynthesis and stellar structure and evolution

1993; IOP Publishing; Volume: 415; Linguagem: Inglês

10.1086/187026

1538-4357

Gary Steigman, Brian D. Fields, Keith A. Olive, David N. Schramm, Terry P. Walker,

Gamma-ray bursts and supernovae

view Abstract Citations (66) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Population II 6Li as a Probe of Nucleosynthesis and Stellar Structure and Evolution Steigman, Gary ; Fields, Brian D. ; Olive, Keith A. ; Schramm, David N. ; Walker, Terry P. Abstract We discuss the importance of Population II Li-6 as a diagnostic for models of primordial nucleosynthesis, cosmic-ray nucleosyntheses in the early Galaxy, and the structure and evolution of metal-poor solar-type stars. The observation of Li-6 in the subdwarf HD 84937 is shown to be consistent with the existing Population II LiBeB data within the context of a simple three-component model: (1) standard big bang nucleosynthesis, (2) Population II cosmic-ray nucleosynthesis, (3) standard (nonrotating) stellar LiBeB depletion. If this interpretation is correct, we predict a potentially detectable boron abundance for this star: about 2 x 10 exp -12. Subsequent Population II LiBeB observations, and in particular further observations of Population II Li-6, are shown to be crucial to our understanding of the primordial and early galactic creation and destruction mechanisms for light elements. Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/187026 Bibcode: 1993ApJ...415L..35S Keywords: Lithium Isotopes; Metallicity; Nuclear Fusion; Stellar Evolution; Stellar Structure; Galactic Evolution; Stellar Composition; Astrophysics; GALAXIES: ABUNDANCES; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; ABUNDANCES; STARS: ABUNDANCES full text sources ADS | data products SIMBAD (1)