Beryllium in the Ultra-Lithium-Deficient,Metal-Poor Halo Dwarf, G186-26

Details Beryllium in the Ultra-Lithium-Deficient,Metal-Poor Halo Dwarf, G186-26 Beryllium in the Ultra-Lithium-Deficient,Metal-Poor Halo Dwarf, G186-26

2005-09-16

arxiv.org/abs/astro-ph/0509483v1

Astrophys.J.633:L125-L128,2005

Astronomy and Astrophysics

Astrophysics

Accepted for Ap.J. Letters 10 pages, 4 figures

Scientific paper

10.1086/498021

The vast majority of low-metal halo dwarfs show a similar amount of Li; this has been attributed to the Li that was produced in the Big Bang. However, there are nine known halo stars with T $>$ 5900 K and [Fe/H] $<$ $-$1.0 that are ultra-Li-deficient. We have looked for Be in the very low metallicity star, G 186-26 at [Fe/H] = $-$2.71, which is one of the ultra-Li-deficient stars. This star is also ultra-Be deficient. Relative to Be in the Li-normal stars at [Fe/H] = $-$2.7, G 182-26 is down in Be by more than 0.8 dex. Of two potential causes for the Li-deficiency -- mass-transfer in a pre-blue straggler or extra rotationally-induced mixing in a star that was initially a very rapid rotator -- the absence of Be favors the blue-straggler hypothesis, but the rotation model cannot be ruled-out completely.

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