169 citations · 492 across the 14 of their papers we have counts for
14 papers
Non-LTE abundance analysis of A-B stars with low rotational velocities. II. Do A-B stars with normal abundances exist?
A. M. Romanovskaya, T. A. Ryabchikova, Yu. V. Pakhomov +2
We present chemical composition and fundamental parameters (the effective temperature, surface gravity and radius) for four sharp-lined A-type stars Gem (HD 41705), o Peg (HD 2…
1D non-LTE corrections for chemical abundance analyses of very metal-poor stars
L. Mashonkina, Yu. Pakhomov, T. Sitnova +3
Detailed chemical abundances of very metal-poor (VMP, [Fe/H] < -2) stars are important for better understanding the First Stars, early star formation and chemical enrichment of gal…
Detailed abundances of the wide pairs of stars with and without planets: the binary systems 16 Cyg and HD 219542
T. Ryabchikova, Yu. Pakhomov, L. Mashonkina +1
We present results of the comparative analysis of the two wide binary systems -- 16 Cyg, with a giant gas planet orbiting around 16 Cyg B, and HD 219542 without planet detected. At…
The formation of the Milky Way halo and its dwarf satellites: A NLTE-1D abundance analysis. V. The Sextans galaxy
L. Mashonkina, Yu. V. Pakhomov, T. Sitnova +3
We present a homogeneous set of accurate atmospheric parameters for a sample of eleven very metal-poor (-3.32 <= [Fe/H] <= -2.61) stars in the Sextans dwarf spheroidal galaxy (dSph…
Fundamental parameters and abundance analysis of the components in the SB2 system HD 60803
T. Ryabchikova, S. Zvyagintsev, A. Tkachenko +3
We performed a detailed spectroscopic study of the SB2 system HD 60803 based on high-resolution spectra obtained with the different spectrographs. The analysis was done with two in…
The formation of the Milky Way halo and its dwarf satellites: a NLTE-1D abundance analysis. IV. Segue 1, Triangulum II, and Coma Berenices UFDs
T. M. Sitnova, L. I. Mashonkina, A. M. Tatarnikov +6
We present atmospheric parameters and abundances for chemical elements from carbon to barium in metal-poor stars in Segue 1 (seven stars), Coma Berenices (three stars), and Triangu…
Abundances of alpha-Process Elements in Thin-Disk, Thick-Disk, and Halo Stars of the Galaxy: Non-LTE Analysis
Lyudmila Mashonkina, Maria Neretina, Tatyana Sitnova +1
The atmospheric parameters and abundances of Mg, Si, Ca, and Ti have been determined for 20 stars using the Gaia DR2 parallaxes, high-resolution spectra, and the non-local thermody…
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…
Program package for the analysis of high resolution high signal-to-noise stellar spectra
N. Piskunov, T. Ryabchikova, Yu. Pakhomov +4
The program package SME (Spectroscopy Made Easy), designed to perform an analysis of stellar spectra using spectral fitting techniques, was updated due to adding new functions (iso…
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…
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…
Systematic non-LTE study of the [Fe/H] F and G dwarfs in the solar neighbourhood. II. Abundance patterns from Li to Eu
G. Zhao, L. Mashonkina, H. L. Yan +14
For the first time, we present an extensive study of stars with individual non-local thermodynamic equilibrium (NLTE) abundances for 17 chemical elements from Li to Eu in a sample…
Systematic NLTE study of the -2.6 < [Fe/H] < 0.2 F and G dwarfs in the solar neighbourhood. I. Stellar atmosphere parameters
T. Sitnova, G. Zhao, L. Mashonkina +9
We present atmospheric parameters for 51 nearby FG dwarfs uniformly distributed over the -2.60 < [Fe/H] < +0.20 metallicity range that is suitable for the Galactic chemical evoluti…