62 citations · 351 across the 22 of their papers we have counts for
21 papers
Fundamental parameters of the Ap-stars GO And, 84 UMa, and Psc
A. Romanovskaya, D. Shulyak, T. Ryabchikova +1
The aim of this work is to determine fundamental parameters of three Ap stars, GO And (HD 4778), Psc (HD 220825), and 84 UMa (HD 120198), using spectroscopic techniques. By ana…
Neon Abundances of B-stars in the Solar Neighborhood
Sofya Alexeeva, Tianxiang Chen, Tatyana Ryabchikova +4
We constructed a comprehensive model atom for NeI -- NeII using the most up-to-date atomic data available and evaluated the non-local thermodynamic equilibrium (NLTE) line formatio…
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…
Putting atomic diffusion theory of magnetic ApBp stars to the test: evaluation of the predictions of time-dependent diffusion models
O. Kochukhov, T. A. Ryabchikova
A series of recent theoretical atomic diffusion studies has address the challenging problem of predicting inhomogeneous vertical and horizontal chemical element distributions in th…
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…
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…