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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 spectralresolution (R = 10^5) Keck HIRES spectra. Unlike previous claims of animportant contribution from intermediate-mass AGB stars at low metallicities,we find that the rise of the AGB contribution in the Galactic halo did notoccur until intermediate metallicities ([Fe/H] ~> -1.5).Comment: ApJ Letters, in pres

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