Search Publications
Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalog. The relative parallax errors for all the stars in this sample do not exceed 10%. Based on a sample of 9750 stars, the group velocity components ${{(U,V,W)}_{ \odot }} = $ (7.21, 7.46, 8.52) ± (0.13, 0.20, 0.10) km/s wer…
Revised Version of the New Catalogue of Suspected Variable Stars, NSV Release 2
Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.
We present NSV Release 2, an electronic version of the "New Catalogue of Suspected Variable Stars". A detailed file-by-file description of the new catalogue version is given. By its structure, we preserve the catalogue as a historical document, but the information it contains has been considerably renewed compared to its first electronic version. …
Binary Clusters: Theory and Observations
Vereshchagin, S. V.; Chupina, N. V.; Tutukov, A. V. +2 more
The aim of this study is to search for close binary gravitationally bound pairs of open star clusters (CBOCs). We divided the observed pairs of clusters into visual binaries (VBOCs) and close pairs of CBOCs. Close pairs are physically bound clusters; the distances between them do not exceed 7 pc. These include pairs of clusters whose distances and…
Analysis of the Distance Scales by Cepheids from the Gaia EDR3 Catalogue Data
Bobylev, V. V.; Bajkova, A. T.
We study the kinematics of a sample of classical Cepheids younger than 120 Myr. For these stars, the estimates of distances taken from Skowron et al., which are based on the period-luminosity relation, and the line-of-sight velocities and the proper motions from the Gaia catalog are available. There are also distance estimates derived from the tri…
Circumsolar Stellar Streams and Meteors in the Earth Atmosphere
Vereshchagin, S. V.; Chupina, N. V.; Tutukov, A. V.
On the basis of the Gaia data, we analyze the formation pattern of peripherical structures of planetary systems, the elements of which are dust, asteroids, comets, and unbound planets (the so-called ACP structures). These structures, "ACP spears," are as large as 30 to 104 pc; and, intersecting one with another, they permeate the Galaxy…
On the Status of the Star Schulte 12 in the Association Cyg OB2
Klochkova, V. G.; Panchuk, V. E.; Islentieva, E. S.
High-resolution spectra of the LBV candidate Schulte 12 in the Cyg OB2 association were obtained at the 6-m BTA telescope with the NES echelle spectrograph on the arbitrary dates in 2001-2022. Variability of the emission profile of Hα and absorptions of He I, Si II with time was found. Based on the radial velocity measurements at 10 obs…
Instability in the System of the Distant Post-AGB Star LS III +52°24 (IRAS 22023+5249)
Miroshnichenko, A. S.; Klochkova, V. G.; Panchuk, V. E. +2 more
The optical spectra of the B-supergiant LS III +52°24 (IRAS 22023+5249) obtained at the 6-m BTA telescope with a resolution ${R} ≥slant 60{\kern 1pt} {\kern 1pt} 000$ in 2010-2021 revealed signs of wind variability and velocity stratification in the extended atmosphere. The neutral hydrogen lines H$α $ and H$β $ have a P Cyg profile; their wind ab…
Globular Cluster as Indicators of Galactic Evolution
Pilipenko, S. V.; Arkelyan, N. R.
We have studied the system of globular clusters (GCs) that formed in other galaxies and eventually accreted onto the Milky Way. Thus, the samples of GCs belonging to different tidal streams, obtained on the basis of the latest data from the GAIA observatory, were taken from the literature. We measured the anisotropy of the distribution of these GC…
Interstellar Extinction at High Galactic Latitudes: An Analytical Approximation
Kovaleva, D. A.; Malkov, O. Yu.; Avdeeva, A. S. +1 more
Distance dependences of interstellar extinction (${{A}V}(d)$) for a number of high-latitude areas of the southern sky were obtained using the data of the RAVE DR6 spectroscopic survey and the Gaia DR2/EDR3 astrometric survey. These dependencies were approximated by the classical barometric function (cosecant law). Function parameters we…
On Some Issues of Cross-Identification of Astronomical Catalogs
Sobolev, A. M.; Ladeyschikov, D. A.
The paper deals with the issues of cross-identification of sources from various astronomical catalogs. One of the main problems under consideration is how to cross-identify a large number of catalogs in a selected region in the sky when there is no reference source catalog? For cross-identification of large amounts of data, it is proposed to use t…