Search Publications
Kinematics of High-Velocity Stars within 300 pc from the Sun according to Gaia DR3
Vereshchagin, S. V.; Chupina, N. V.; Tutukov, A. V.
The kinematics of stars from the solar neighborhood with a radius of 300 pc has been studied using the Gaia DR3 data. Our sample includes n = 970 171 stars—AG300 (A—ensemble, G—Gaia, 300—radius of the studied zone in pc). The kinematics of these stars reflects the morphology of the main stellar populations of the Galaxy: the stellar disk, bulge, h…
Star Structure of the Northern Part of the Orion Sword Region
Vereshchagin, S. V.; Chupina, N. V.
According to the data of the Gaia DR3 catalogs, the belonging of the stars of group 189 ([1]), located in the northern part of the Orion Sword region, to the open star cluster (OSC) NGC 1977 was analyzed. To do this, the revision of the stellar composition of the northern part of the Orion Sword region (around the center of the OSC NGC 1977) was c…
GAIA Arguments for and against a Hypothetical Sun Companion
Malkov, O. Yu.
The hypothesis that the Sun is a component of a binary star system has been around for about a hundred years. Assumptions about the nature of the companion continue to be published as new observational data become available. The paper shows that the results of the work of the Gaia space observatory impose certain restrictions on the nature and loc…
Effect of the Eccentricity of the Planet's Orbit on the Limb Darkening Coefficients of the Eclipsed Star
Cherepashchuk, A. M.; Bekesov, E. V.
It is shown that the introduction of a small orbital eccentricity into the model of a binary system with an exoplanet, which is allowed by errors in determining the radial velocities of the eclipsed star, makes possible to significantly reduce and even eliminate the difference in the wavelength dependences between the observed and theoretical valu…
The Catalog of Resolved Spectroscopic Binaries: Development and Description
Malkov, O. Yu.; Pakhomova, P. V.; Zeleke, D. B. +2 more
Resolved spectroscopic binaries are unique among other types of binaries. They provide the only possibility (aside from trigonometric parallaxes) to accurately determine distances to objects, which is one of the most important characteristics in astronomy. Such binaries are not numerous, but an exhaustive catalog of them still does not exist. The …
Calibration of Uncertainties of the Gaia DR3 Catalog Based on Data on Wide Binary Stars of the Galaxy Field
Kovaleva, D. A.
The catalog of wide binary stars [1], created on the basis of Gaia EDR3 data and including more than a million pairs, was used to analyze Gaia DR3 data obtained independently for their components. It is shown that the spatial heterogeneity of the catalog reflects the Gaia scanning law. The change in the spatial density of binary stars in the catal…
The Near Infrared and Optical Photometric Activity of V517 Cyg
Larionov, V. M.; Arkharov, A. A.; Klimanov, S. A. +5 more
A near infrared and optical photometric study of Herbig star V517 Cyg has been carried out. The infrared data were obtained in 2003-2017 at the Campo Imperatore Observatory (Italy) with the Pulkovo AZT-24 telescope in the Johnson JHK bands. The optical light curves in the Johnson UBVR bands were obtained at the Maidanak observatory. Additional opt…
Dynamic Study of the Triple Star T Tauri
Romanenko, L. G.; Kiyaeva, O. V.
The triple system of young stars T Tauri was discovered relatively recently and has attracted the attention of numerous researchers. Many papers have been dedicated to the study of the physical properties of the system's stars, which are surrounded by a disk of dust and gas. Our work is focused on the astrometric analysis of this triple system usi…
Investigation of the Effect of the Errors of Limb Darkening Coefficients on the Geometric Parameters of a Binary System with an Exoplanet
Abubekerov, M. K.; Gostev, N. Yu.
Based on the observed light curves of Kepler-5, Kepler-6, Kepler-7, HD 209458, a search was made for the geometric parameters of a binary system with an exoplanet for different values of the limb darkening coefficients of the parent star. It is shown that for the observed light curves with relative accuracy ${{10}^{{ - 4}}}{-} {{10}^{{ - 5}}}$, an…
Formation of Sources for Solar Cosmic Rays in Eruptive Flares X6.9 and M5.1 Observed August 9, 2011, and May 17, 2012
Struminsky, A. B.; Grigorieva, I. Yu.
A coronal mass ejection (CME) and solar proton event (SPE) succeeding weak flares in soft X-rays and being observed in the interplanetary space (IS) is not any unusual. However, it remains unclear in what way extreme CME and SPE characteristics can be realized in such cases. The present work compares solar and IS observations associated with the l…