Magnesium Isotopes in Halo Stars
Jorge Melendez (RSAA, ANU), Judith G. Cohen (Caltech)
TL;DR
This study measures magnesium isotope ratios in halo stars and finds that their ratios can be explained by massive stars, challenging previous claims of AGB star contributions to the Galactic halo.
Contribution
It provides high-resolution spectral measurements of Mg isotopes in halo stars, offering new insights into their nucleosynthetic origins.
Findings
Mg isotope ratios are consistent with massive star contributions.
No significant evidence for AGB star influence in the halo.
High spectral resolution enables precise isotope ratio determination.
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) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate-mass AGB stars to the Galactic halo, we find that our Mg/Mg ratios can be explained by massive stars.
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