On the evolution of lithium 7 in globular clusters

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Globular Clusters, Lithium, Metallicity, Stellar Evolution, Nuclear Fusion, Stellar Composition, Stellar Luminosity

Scientific paper

The inhomogeneous big-bang models flourishing presently in the literature predict that the primordial mass fraction of Li-7 could reach 10 to the -7th, whereas the observed value in unevolved halo stars is about 6 x 10 to the -10th, in marked contrast. Using a simple model of chemical evolution of globular clusters, it is shown that these results cannot be reconciled: Li-7 is unsignificantly depleted in the cluster gas during the limited time of star formation, whereas the abundance of Fe, originating from relatively massive and short-lived stars increases by two orders of magnitude. The observed constancy of log (Li/H) versus (Fe/H) is thus reproduced.

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