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Published March 11, 2008 | Submitted + Published
Book Section - Chapter Open

Magnesium Isotopes in Halo Stars

Abstract

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 = 10^5) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate‐mass AGB stars to the Galactic halo, we find that our ^(26)Mg/^(24) Mg ratios can be explained by massive stars.

Additional Information

© 2008 American Institute of Physics. Published online 11 March 2008. We thank D. Yong and W Aoki for kindly providing a Subaru spectrum of M71 A4. JM acknowledges partial support from the Australian Research Council to Martin Asplund. JGC is grateful for partial support to NSF grant AST-0507219.

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