Mg Isotope Ratios in Giant Stars of the Globular Clusters M13 and M71
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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|Source:||Astrophysical Journal, The|
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