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New Extremely Metal-Poor Stars in the Galactic Halo
Judith G. Cohen, Norbert Christlieb, Andrew McWilliam +5
We present a detailed abundance analysis based on high resolution and high signal-to-noise spectra of eight extremely metal poor (EMP) stars with [Fe/H] < -3.5$ dex, four of which…
Magnesium Isotopes in Halo Stars
Jorge Melendez, Judith G. Cohen
We have determined Mg isotope ratios in halo field dwarfs and giants in the globular cluster M71 based on high S/N high spectral resolution (R = 10) Keck HIRES spectra. Unlike…
A New Type of Extremely Metal Poor Star
Judith G. Cohen, Andrew McWilliam, Norbert Christlieb +5
We present an abundance analysis for the extremely metal poor star HE1424-0241 based on high dispersion spectra from HIRES at Keck. This star is a giant on the lower red giant bran…
Magnesium Isotopes in Metal-Poor Dwarfs, the Rise of AGB Stars and the Formation Timescale of the Galactic Halo
Jorge Melendez, Judith G. Cohen
We have determined magnesium isotopic ratios (^{25,26}Mg/Mg) in metal-poor (-2.6 [Fe/H] -1.3) halo dwarfs employing high S/N (90-280) high spectral resolution (R = 10^5) Keck HIRES…