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Author name code: botnen
ADS astronomy entries on 2022-09-14
author:"Botnen, A.V." 

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Title: Multi-level 3D non-LTE computations of lithium lines in the
    metal-poor halo stars HD 140283 and HD 84937
Authors: Asplund, M.; Carlsson, M.; Botnen, A. V.
2003A&A...399L..31A    Altcode: 2003astro.ph..2406A
  The lithium abundances in metal-poor halo stars are of importance
  for cosmology, galaxy evolution and stellar structure. In an attempt
  to study possible systematic errors in the derived Li abundances,
  the line formation of Li I lines has been investigated by means of
  realistic 3D hydrodynamical model atmospheres of halo stars and
  3D non-LTE radiative transfer calculations. These are the first
  detailed 3D non-LTE computations reported employing a multi-level
  atomic model showing that such problems are now computationally
  tractable. The detailed computations reveal that the Li I population
  has a strong influence from the radiation field rather than the local
  gas temperature, indicating that the low derived Li abundances found by
  Asplund et al. (\cite{Asplund1999}) are an artifact of their assumption
  of LTE. Relative to 3D LTE, the detailed calculations show pronounced
  over-ionization. In terms of abundances the 3D non-LTE values are
  within 0.05 dex of the 1D non-LTE results for the particular cases of
  HD 140283 and HD 84937, which is a consequence of the dominance of the
  radiation in determining the population density of Li I. Although 3D
  non-LTE can be expected to give results rather close (~+/- 0.1 dex)
  to 1D non-LTE for this reason, there may be systematic trends with
  metallicity and effective temperature.

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Title: Multi3D, 3D Non-LTE Radiative Transfer
Authors: Botnen, A.; Carlsson, M.
1999ASSL..240..379B    Altcode: 1999numa.conf..379B
  No abstract at ADS

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Title: Radiative transfer in 3D
Authors: Botnen, A.
1997MsT..........2B    Altcode:
  No abstract at ADS