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Ultra-lithium-deficient halo stars

Published online by Cambridge University Press:  23 April 2010

Lisa M. Elliott  and
Sean G. Ryan
Lisa M. Elliott
Affiliation:
Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences Building 28, Monash University, Victoria, 3800, Australia email: [email protected]
Sean G. Ryan
Affiliation:
School of Physics, Astronomy and Mathematics, and Centre for Astrophysics Research, University of Hertfordshire, College Lane Hatfield AL10 9AB, United Kingdom email: [email protected]
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Abstract

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While most warm halo dwarfs show lithium abundances at the level of the Spite Plateau, a small number (~5%) have undetectable lithium lines. The existence of these stars has long raised questions when interpreting the plateau abundances: are they an extreme example of a depletion mechanism that has affected the plateau stars, or do they have an entirely different history? We provide an overview of what is currently known about the lithium-poor halo stars and discuss a possible origin for the lithium deficiency in this unique group of stars.

Keywords

stars: abundancesblue stragglers – Galaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 331 - 332
Copyright
Copyright © International Astronomical Union 2010

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