62 citations · 227 across the 13 of their papers we have counts for
13 papers
Three nearby K-giants with planets: Accurate determination of basic parameters, including an analysis of metallicity based on Fe I lines
L. S. Lyubimkov, D. V. Petrov, D. B. Poklad
Fundamental parameters are determined for three bright, nearby K-giants, β Gem (K0 III), μ Leo (K2 III), and α Tau (K5 III). It is notable that around all three stars the giant pla…
Oxygen abundance and the N/C vs N/O relation for AFG supergiants and bright giants
L. S. Lyubimkov, S. A. Korotin, D. L. Lambert
Non-LTE analysis (LTE is local thermodynamic equilibrium) of the oxygen abundances for 51 Galactic A-, F- and G-type supergiants and bright giants is performed. In contrast with ca…
Light chemical elements in stars: mysteries and unsolved problems
L. S. Lyubimkov
The first eight elements of the periodic table are discussed: H, He, Li, Be, B, C, N, and O. They are referred to as key elements, given their important role in stellar evolution.…
Analysis of the non-LTE lithium abundance for a large sample of F-, G-, and K-giants and supergiants
L. S. Lyubimkov, D. V. Petrov
A five-dimensional interpolation method and corresponding computer program are developed for using published calculations to determine the non-LTE correction {Δ\}NLTE to the lithiu…
The N/O ratio in early B-type main sequence stars as an indicator of their evolution
L. S. Lyubimkov
It is shown that, in the case of early B-type main-sequence stars, of the three ratios N/C, C/O, and N/O which are regarded as indicators of stellar evolution, the ratio N/O is mor…
Lithium in stellar atmospheres: observations and theory
L. S. Lyubimkov
Of all the light elements, lithium is the most sensitive indicator of stellar evolution. This review discusses current data on the abundance of lithium in the atmospheres of A-, F-…
The Cool Giant HD 77361 - A Super Li-Rich Star
L. S. Lyubimkov, B. M. Kaminsky, V. G Metlov +3
Super Li-rich stars form a very small and enigmatic group whose existence cannot be explained in terms of the standard stellar evolution theory. The goal of our study is to check t…
Determining the effective temperatures of G- and K-type giants and supergiants based on observed photometric indices
L. S. Lyubimkov, D. B. Poklad
A method for determining the effective temperature Teff of G- and K-type giants and supergiants is proposed. The method is based on the use of two photometric indices free from the…
Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants
Leonid S. Lyubimkov, David L. Lambert, Sergey A. Korotin +2
Based on our prior accurate determination of fundamental parameters for 36 Galactic A-, F- and G-type supergiants and bright giants (luminosity classes I and II), we undertook a no…
Possible Overionization of C II, N II, and O II Ions in the Atmospheres of Early B- and Late O-Type Stars
Leonid S. Lyubimkov
The reliability of C, N, and O abundances determined from the C II, N II, and O II lines in the main sequence (MS) early B- and late O-type stars is examined. This analysis is base…
Lithium abundance in atmospheres of F- and G-type supergiants and bright giants
Leonid S. Lyubimkov, David L. Lambert, Bogdan M. Kaminsky +3
We present a non-local thermodynamic equilibrium abundance analysis of the resonance doublet Li I at 6707.8 A for 55 Galactic F and G supergiants and bright giants. The derived lit…
Nitrogen Enrichment in Atmospheres of A- and F- Type Supergiants
Leonid S. Lyubimkov, David L. Lambert, Sergey A. Korotin +3
Using new accurate fundamental parameters of 30 Galactic A and F supergiants, namely their effective temperatures Teff and surface gravities log g, we implemented a non-LTE analysi…
Accurate Fundamental Parameters or A, F, and G-type Supergiants in the Solar Neighbourhood
Leonid S. Lyubimkov, David L. Lambert, Sergey I. Rostopchin +2
The following parameters are determined for 63 Galactic supergiants in the solar neighbourhood: effective temperature Teff, surface gravity log g, iron abundance log e(Fe), microtu…