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Multi-Epoch High-Spectral-Resolution Observations of Neutral Sodium in 14 Type Ia Supernovae
A. Sternberg, A. Gal Yam, J. D. Simon +16
One of the main questions concerning Type Ia supernovae is the nature of the binary companion of the exploding white dwarf. A major discriminant between different suggested models…
The Aquarius Co-Moving Group is Not a Disrupted Classical Globular Cluster
Andrew R. Casey, Stefan Keller, Alan Alves-Brito +8
We present a detailed analysis of high-resolution, high S/N spectra for 5 Aquarius stream stars observed with the MIKE spectrograph on the Magellan Clay telescope. Our sample repre…
High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun
TalaWanda R. Monroe, Jorge Meléndez, Iván Ramírez +13
We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with preci…
High Precision Differential Abundance Measurements in Globular Clusters: Chemical Inhomogeneities in NGC 6752
David Yong, Jorge Melendez, Frank Grundahl +9
We report on a strictly differential line-by-line analysis of high quality UVES spectra of bright giants in the metal-poor globular cluster NGC 6752. We achieved high precision dif…
Sodium content as a predictor of the advanced evolution of globular cluster stars
Simon W. Campbell, Valentina D'Orazi, David Yong +6
The asymptotic giant branch (AGB) phase is the final stage of nuclear burning for low-mass stars. Although Milky Way globular clusters are now known to harbour (at least) two gener…
Magnesium Isotope Ratios in omega Centauri Red Giants
G S Da Costa, John E Norris, David Yong
We have used high resolution observations obtained at the AAT with UHRF (R ~ 100,000) and at Gemini-S with b-HROS (R ~ 150,000) to determine magnesium isotope ratios for seven omeg…