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Fundamental parameters of Ap-star HD 108662
Romanovskaya, A. M.; Ryabchikova, T. A.; Shulyak, D. V.
We present the results of self-consistent spectroscopic analysis of the atmosphere of Ap-star HD 108662 based on high resolution spectrum and spectrophotometric observations in a wide wavelength range. Magnetic field effects were taking into account. Abundances of 24 chemical elements were derived, and stratification of Fe which lines make the mai…
Observational signs of wide binary stars dissolution in Gaia DR2 data
Kovaleva, D. A.; Sapozhnikov, S. A.
Binary and common proper motion stars within 100 pc of the Sun are being investigated using Gaia DR2 data. An artificial random pairs sample is constructed to exclude possible random pairing contamination. Numerical estimation of this contamination shows that the chosen method to select the common proper motion stars yields little contamination ev…
The kinematics of OB-stars and Cepheids based on Gaia DR2 catalogue
Pakhomova, P. V.
The purpose of the work was to study the kinematics and refine the distance scale of young objects of the galactic disk: OB stars and high-luminosity stars of late spectral classes, as well as Cepheids. We used the observational data obtained during the Gaia mission and published in the Gaia DR2 catalog. The statistical parallax method was used to…
On possibility using photometry of Landolt fields for determination of stellar parameters and interstellar reddening
Pakhomov, Yu. V.; Stepina, Yu. A.
The paper analyzes the possibility of determination of stellar parameters and interstellar reddening based on UBVRIJHK photometry of secondary standards of the Landolt field S98. It is shown that the accuracy of photometric measurements should be 0.010 - 0.015 m or better and, at least 0.02 m , if a measured parallax is available.