Abstract
view Abstract Citations (175) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Synthesis of Lithium and s-Process Elements in Small Magellanic Cloud Asymptotic Giant Branch Stars Smith, Verne V. ; Lambert, David L. Abstract High-resolution spectroscopy is presented for five luminous (M_bol_ ~ -6 to -7) asymptotic giant branch (AGB) stars in the Small Magellanic Cloud (SMC). These stars are found to be metal-poor ([Fe/H] ~ -0.5) but s-process-enriched, relative to Fe-peak elements, by up to a factor of 10: these are s-process enhancements that are comparable to those observed in Galactic S stars; thus, these SMC AGB stars have experienced a third dredge-up. Of more interest is the fact that all five red giants have rather strong Li I resonance lines (6707 A); an abundance analysis reveals these stars to have Li abundances that are 100-1000 times that expected in red giants. We argue that these very luminous (and probably massive) AGB stars have synthesized Li as predicted by certain stellar models of hot-bottom convective-envelope burning. We discuss the observations and models as a basis for understanding certain phases of red giant evolution and as a potentially significant source of Li in the universe. Publication: The Astrophysical Journal Pub Date: October 1989 DOI: 10.1086/185556 Bibcode: 1989ApJ...345L..75S Keywords: Abundance; Asymptotic Giant Branch Stars; Late Stars; Magellanic Clouds; Nuclear Fusion; Red Giant Stars; Astronomical Spectroscopy; Lithium; Quantitative Analysis; Stellar Evolution; Zirconium Oxides; Astrophysics; ABUNDANCES; NUCLEOSYNTHESIS; STARS: ABUNDANCES; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (7) NED (6)
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