The puzzling origin of the 6Li plateau

Details The puzzling origin of the 6Li plateau The puzzling origin of the 6Li plateau

2008-06-25

arxiv.org/abs/0806.4184v2

MNRAS Letters, 2008, Volume 390, Issue 1, pp. L14-L18

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2008.00524.x

We discuss the 6Li 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 (6Li/H=6x10^-12) nor the flatness of the 6Li distribution with [Fe/H] can be reproduced under the most favourable conditions by any model in which 6Li 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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