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Lithium deficient halo stars: abundance trends and enhanced rotation

Published online by Cambridge University Press:  23 December 2005

Lisa M. Elliott  and
Sean G. Ryan
Lisa M. Elliott
Affiliation:
Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences, Monash University, Clayton, Victoria, 3800 Australia email: [email protected]
Sean G. Ryan
Affiliation:
Department of Physics and Adtronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA UK email: [email protected]
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Abstract

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We present results from a high resolution study of six Li-depleted halo dwarfs. These stars exhibit Lithium abundances more than 0.5 dex below the Spite Plateau. The study is comprised of two parts: 1) a detailed abundance analysis covering many light, alpha, Fe-peak and neutron capture elements and 2) a study of rotational line broadening. We find that there are no common abundance anomalies, other than the Lithium depletion, that distinguish these stars from the Li-normal population. Four of the six stars however, show evidence of abnormally high projected rotation velocities. These findings support a non-standard depletion mechanism in Li-depleted halo stars, and emphasize their necessary exclusion from future studies of the Spite Plateau.

Keywords

Stars: abundancesstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 91 - 92
Copyright
© 2005 International Astronomical Union