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The light elements in the light of 3D and non-LTE effects

Published online by Cambridge University Press:  23 April 2010

Martin Asplund  and
Karin Lind
Martin Asplund
Affiliation:
Max-Planck-Institut für Astrophysik, Postfach 1317, D-85741 Garching, Germany email: [email protected]
Karin Lind
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany email: [email protected]
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Abstract

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In this review we discuss possible systematic errors inherent in classical 1D LTE abundance analyses of late-type stars for the light elements (here: H, He, Li, Be and B). The advent of realistic 3D hydrodynamical model atmospheres and the availability of non-LTE line formation codes place the stellar analyses on a much firmer footing and indeed drastically modify the astrophysical interpretations in many cases, especially at low metallicities. For the Teff-sensitive hydrogen lines both stellar granulation and non-LTE are likely important but the combination of the two has not yet been fully explored. A fortuitous near-cancellation of significant but opposite 3D and non-LTE effects leaves the derived 7Li abundances largely unaffected but new atomic collisional data should be taken into account. We also discuss the impact on 3D non-LTE line formation on the estimated lithium isotopic abundances in halo stars in light of recent claims that convective line asymmetries can mimic the presence of 6Li. While Be only have relatively minor non-LTE abundance corrections, B is sensitive even if the latest calculations imply smaller non-LTE effects than previously thought.

Keywords

convectionline: formationradiative transferSun: abundancesSun: atmospherestars: abundancesstars: atmospheresstars: Population IIGalaxy: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 191 - 200
Copyright
Copyright © International Astronomical Union 2010

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