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Understanding the Characteristics of EMP Stars as Probes for the Early Universe: Stellar Evolution of Low‐ and Intermediate‐Mass EMP Stars
2008
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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. Five giants in the globular cluster M71 ([Fe/H] = -0.7, [17]) were observed with HIRES atR = 10^. We present the analysis of three of them and also of M71 A4 ob-CP990, First Stars m, edited
doi:10.1063/1.2905563
fatcat:dtjuvvctzze2tbu7apk7gc2ksu