Magnesium Isotopes in Metal-poor Dwarfs: The Rise of AGB Stars and the Formation Timescale of the Galactic Halo

Melendez Moreno, Jorge; Cohen, Judith G

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Magnesium Isotopes in Metal-poor Dwarfs: The Rise of AGB Stars and the Formation Timescale of the Galactic Halo

Date

2007

Authors

Melendez Moreno, Jorge

Cohen, Judith G

Publisher

IOP Publishing

Abstract

We have determined magnesium isotopic ratios ( 25, 26Mg/Mg) in metal-poor (-2.6 ≤ [Fe/H] ≤ -1.3) halo dwarfs employing high signal-to-noise ratio (S/N = 90-280), high spectral resolution (R = 10 5) Keck High Resolution Echelle Spectrometer (HIRES) spe