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Abundances of α-Process Elements in Thin-Disk, Thick-Disk, and Halo Stars of the Galaxy: Non-LTE Analysis
Sitnova, T. M.; Mashonkina, L. I.; Pakhomov, Yu. V. +1 more
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 modeling of lines without assuming LTE (non-LTE modeling). A sample of stars with homogeneous data on the abundances of α-process elements has thus been increased to 94. It is shown that appl…
Flow Structure in the Eclipsing Polar V808 Aur. Results of 3D Numerical Simulations
Bisikalo, D. V.; Zhilkin, A. G.; Gabdeev, M. M. +1 more
The structure of the flows in the eclipsing polar V808 Aur is studied. Comparison of computations with observed light curves is used to identify and clarify a number of features in the system, such as the drift of the hot spot—the place where the stream from the inner Lagrange point approaches the surface of the white dwarf, changes in the brightn…
Results of Many-year Photometry of the Herbig Ae Star AB Aur in the Near Infrared
Grinin, V. P.; Shenavrin, V. I.; Baluev, R. V. +1 more
The results of many-year infrared observations of the Herbig AeBe star AB Aur at 1-5 µm (JHKLM bands) are presented. The duration of the photometric series, together with observations published earlier, is about 18 years. The observations demonstrate that, in contrast to the optical, the star is quite active in the studied infrared range. Th…
Chemical Composition of Globular Clusters of Milky Way Subsystems from Gaia DR2 Data
Bobylev, V. V.; Bajkova, A. T.; Korchagin, V. I. +1 more
Results of a study of the kinematic and chemical properties of globular clusters of the Milky Way based on data from the Gaia DR2 catalog and meaurements with the Hubble Space Telescope are presented. A new method for dividing globular clusters into Galatic subsystems based on the elements of their Galactic orbits is proposed. Samples of globular …
Features of the Residual Velocity Ellipsoid of Hot Subdwarfs from the Gaia DR2 Catalog
Bobylev, V. V.; Bajkova, A. T.
The evolution of the parameters of the residual velocity ellipsoid of hot subdwarfs (HSDs) with their position relative to the Galactic plane is traced, using the HSDs selected by Geier et al. from the Gaia DR2 catalog. Parameters of the Galactic rotation are determined for two ∣ z∣ zones. These are used to estimate the gradient of the circular ro…