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Chemical composition of metal-poor stars in Coma Berenices ultra-faint dwarf galaxy as a proxy to individual chemical enrichment events
Tatyana Sitnova, Lyudmila Mashonkina, Andrey Tatarnikov +3
We present NLTE abundances and atmospheric parameters for three metal-poor stars ([Fe/H]<-2) in Coma Berenices ultra-faint dwarf galaxy (UFD). The derived results are based on new…
NLTE line formation for Mg\ione\ and Mg\ii\ in atmospheres of B-A-F-G-K stars
Sofya Alexeeva, Tatiana Ryabchikova, Lyudmila Mashonkina +1
Non-local thermodynamical equilibrium (NLTE) line formation for Mg I and Mg II lines is considered in classical 1D-LTE model atmospheres of the Sun and 17 stars with reliable atmos…
Influence of Inelastic Collisions with Hydrogen Atoms on Non-LTE Oxygen Abundance Determination in the Sun and late-type stars
Tatyana Sitnova, Lyudmila Mashonkina
We present the non-local thermodynamic equilibrium (non-LTE) calculations for O I with the updated model atom that includes quantum-mechanical rate coefficients for O I + H I inela…
A NLTE line formation for neutral and singly-ionised calcium in model atmospheres of B-F stars
Tatyana Sitnova, Lyudmila Mashonkina, Tatyana Ryabchikova
We present non-local thermodynamic equilibrium (NLTE) line formation calculations for Ca I and Ca II in B-F stars. The sign and the magnitude of NLTE abundance corrections depend o…