169 citations · 430 across the 16 of their papers we have counts for
5 papers · 2 filters
NLTE abundances of C, O, Ca, Ti, and Fe in the reference BAF-type stars
Tatyana Sitnova, Tatyana Ryabchikova, Sofya Alexeeva +1
We present accurate methods of abundance determination based on the non-local thermodynamic equilibrium (NLTE) line formation for carbon, oxygen, calcium, titanium, and iron in the…
The formation of the Milky Way halo and its dwarf satellites; a NLTE-1D abundance analysis. II. Early chemical enrichment
L. Mashonkina, P. Jablonka, T. Sitnova +2
We present the non-local thermodynamic equilibrium (NLTE) abundances of up to 10 chemical species in a sample of 59 very metal-poor (VMP, -4 < [Fe/H] < -2) stars in seven dwarf sph…
Impact of NLTE on determinations of atmospheric parameters and chemical abundances of very metal-poor stars
Lyudmila Mashonkina, Tatyana Sitnova, Yuri Pakhomov +1
Based on high-resolution spectral observations for a sample of very metal-poor stars, we investigate how well stellar chemical abundances can be derived with available theoretical…
Influence of inelastic collisions with hydrogen atoms on the non-LTE modelling of Ca I and Ca II lines in late-type stars
L. Mashonkina, T. Sitnova, A. K. Belyaev
We perform the non-local thermodynamic equilibrium (NLTE) calculations for Ca I-II with the updated model atom that includes new quantum-mechanical rate coefficients for Ca I + H I…
The formation of the Milky Way halo and its dwarf satellites, a NLTE-1D abundance analysis. I. Homogeneous set of atmospheric parameters
L. Mashonkina, P. Jablonka, Yu. Pakhomov +2
We present a homogeneous set of accurate atmospheric parameters for a complete sample of very and extremely metal-poor stars in the dwarf spheroidal galaxies (dSphs) Sculptor, Ursa…