We discuss the Li-6 abundance evolution within a hierarchical model of Galaxy formation which correctly reproduces the [Fe/H] distribution of metal-poor halo stars. Contrary to previous findings, we find that neither the level (Li-6/H = 6 x 10(-12)) nor the flatness of the Li-6 distribution with [Fe/H] can be reproduced under the most favourable conditions by any model in which Li-6 production is tied to a (data-constrained) Galactic star formation rate via cosmic ray spallation. Thus, the origin of the plateau might be due to some other early mechanism unrelated to star formation.
The puzzling origin of the 6Li plateau / Evoli, Carmelo; Salvadori, Stefania; Ferrara, Andrea. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS. - ISSN 1745-3933. - STAMPA. - 390:(2008), pp. L14-L18. [10.1111/j.1745-3933.2008.00524.x]
The puzzling origin of the 6Li plateau
SALVADORI, STEFANIA;
2008
Abstract
We discuss the Li-6 abundance evolution within a hierarchical model of Galaxy formation which correctly reproduces the [Fe/H] distribution of metal-poor halo stars. Contrary to previous findings, we find that neither the level (Li-6/H = 6 x 10(-12)) nor the flatness of the Li-6 distribution with [Fe/H] can be reproduced under the most favourable conditions by any model in which Li-6 production is tied to a (data-constrained) Galactic star formation rate via cosmic ray spallation. Thus, the origin of the plateau might be due to some other early mechanism unrelated to star formation.
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