Journal Article

Beryllium abundances in metal-poor stars*

K. F. Tan, J. R. Shi and G. Zhao

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 1, pages 205-215
Published in print January 2009 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI:
Beryllium abundances in metal-poor stars*

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We have determined beryllium (Be) abundances for 25 metal-poor stars based on the high-resolution and high signal-to-noise ratio spectra from the Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph data base. Our results confirm that Be abundances increase with Fe, supporting the global enrichment of Be in the Galaxy. Oxygen abundances based on the [O i] forbidden line imply a linear relation with a slope close to one for the Be versus O trend, which indicates that Be is probably produced in a primary process. Some strong evidence is found for the intrinsic dispersion of Be abundances at a given metallicity. The deviation of HD 132475 and HD 126681 from the general Be versus Fe and Be versus O trends favours the predictions of the superbubble model. However, the possibility that such dispersion originates from the inhomogeneous enrichment in Fe and O of the protogalactic gas cannot be excluded.

Keywords: stars: abundances; stars: atmospheres; stars: Population II; Galaxy: evolution; Galaxy: halo

Journal Article.  7208 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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