Yong, David; Aoki, Wako; Lambert, D.L.
We present Mg isotope ratios in four red giants of the globular cluster M13 and one red giant of the globular cluster M71 based on high-resolution, high signal-to-noise ratio spectra obtained with HDS on the Subaru Telescope. We confirm earlier results by Shetrone that for M13 the ratio varies from ( 25Mg + 26Mg)/ 24Mg ≈ 1 in stars with the highest Al abundance to ( 25Mg + 26Mg)/ 24Mg ≈ 0.2 in stars with the lowest Al abundance. However, we separate the contributions of all three isotopes and...[Show more]
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