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The Isotopic Abundances of Magnesium in Stars
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The Isotopic Abundances of Magnesium in Stars
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Isotopic abundance ratios 24^Mg:25^Mg:26^Mg are derived for 20 stars from high- resolution spectra of the MgH A-X 0-0 band at 5140AA. With the exception of the weak g-band giant HR 1299, the stars are dwarfs that sample the metallicity range -1.8 < [Fe/H] <0.0. The abundance of 25^Mg amd 26^Mg relative to the dominant isotope 24^Mg decreases with decreasing [Fe/H] in fair accord with predictions from a recent model of galactic chemical evolution in which the Mg isotopes are synthesised by massive stars. Several stars appear especially enriched in the heavier Mg isotopes suggesting contamination by material from the envelopes of intermediate-mass AGB stars.
Forward citations
Cited by 2 Pith papers
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Magnesium isotope ratios in Milky Way and dwarf galaxy stars
Magnesium isotope ratios in Milky Way and accreted dwarf galaxy stars trace a single universal enrichment track when plotted against [Mg/H], despite differences at fixed [Fe/H].
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The complex stellar system M 22: constraining the chemical enrichment from AGB stars using magnesium isotope ratios
First Mg isotope measurements at [Fe/H]≈-2 in a globular cluster show no difference tied to s-process enrichment, favoring ~2.75 M_sun AGB polluters and a 280–480 Myr age gap.
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