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Stellar Oxygen Abundances.V.Abundances Of Two Hyades Dwarfs Derived From The 6300 Angstroms [Oi] Line, Jeremy R. King, Daniel D. Hiltgen
Stellar Oxygen Abundances.V.Abundances Of Two Hyades Dwarfs Derived From The 6300 Angstroms [Oi] Line, Jeremy R. King, Daniel D. Hiltgen
Publications
We present observations of the 6300 Å [O I] spectral region in two cool Hyades dwarfs, vB 79 and vB 25. We derive a mean iron abundance, [Fe/H]˜+0.11, in good agreement with recent analyses of F and G Hyades dwarfs. The O abundance derived from spectrum synthesis, [O/H]˜+0.15, is between the values deduced by Garcia Lopez et al. (1993, ApJ, 412, 173; [O/H]=-0.05 to -0.10) and King (1993, Ph. D. Dissertation, University of Hawaii; [O/H]=+0.26), who employed the 7774 Å O I triplet in hotter Hyades dwarfs. An accounting of differences between these two 7774 Å analyses is given. Our …
Constraints On The Origin Of The Remarkable Lithium Abundance In The Halo Star Bd+23 3912, Jeremy R. King, Constantine P. Deliyannis, Ann Merchant Boesgaard
Constraints On The Origin Of The Remarkable Lithium Abundance In The Halo Star Bd+23 3912, Jeremy R. King, Constantine P. Deliyannis, Ann Merchant Boesgaard
Publications
The Li abundance of the halo star BD+23 3912 ([Fe/H]=-1.5) lies a factor of 2 - 3 above the Spite plateau. This remarkable difference could reflect either less-than-average stellar Li depletion from a higher primordial Li abundance (as predicted by the Yale rotational stellar evolutionary models), which may have interesting implications for Big Bang nucleosynthesis, or the extraordinary action of Galactic Li production mechanisms. It is also possible that both processes have acted. We use our high resolution, high S/N Keck HIRES spectrum of BD+23 3912 to determine the s-process element abundances and 6Li/7Li ratio in this star. These values …