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Non-local thermodynamic equilibrium stellar spectroscopy with 1D and <3D> models - I. Methods and application to magnesium abundances in standard stars
Maria Bergemann, Remo Collet, Anish M. Amarsi +3
We determine Mg abundances in 6 Gaia benchmark stars using theoretical one-dimensional (1D) hydrostatic model atmospheres, as well as temporally- and spatially-averaged 3D model at…
3D NLTE analysis of the most iron-deficient star, SMSS0313-6708
Thomas Nordlander, Anish M. Amarsi, Karin Lind +5
Models of star formation in the early universe depend on the details of accretion, fragmentation and radiative feedback. Different simulations predict different initial mass functi…
The solar silicon abundance based on 3D non-LTE calculations
A. M. Amarsi, M. Asplund
We present three-dimensional (3D) non-local thermodynamic equilibrium (non-LTE) radiative transfer calculations for silicon in the solar photosphere, using an extensive model atom…
Non-LTE line formation of Fe in late-type stars - III. 3D non-LTE analysis of metal-poor stars
A. M. Amarsi, K. Lind, M. Asplund +2
As one of the most important elements in astronomy, iron abundance determinations need to be as accurate as possible. We investigate the accuracy of spectroscopic iron abundance an…