Search Publications
Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018
Klochkova, V. G.
We shortly summarize here the results of the second stage (1998–2018) of the detailed spectroscopy program of peculiar supergiants identified with galactic infrared sources, performed at the 6-m BTA telescope. The main aspect of the program is a search for the evolutionary variations in the chemical composition of stars, past the AGB stage and the…
Optical Spectrum of Distant OH/IR Star V1648 Aql (IRAS 19386+0155)
Klochkova, V. G.; Tavolzhanskaya, N. S.
We present an optical spectrum of the star V1648 Aql (IRAS19386+0155) obtained at the 6-m SAO RAS telescope with a spectral resolution of R ≥ 60 000. Heliocentric radial velocity was measured from numerous metal absorptions is Vr = 10.18 ± 0.05 km s-1 (VLSR = 18.1 km s-1). We determined the atmospheric, …
CCD Observations and Period Change of the Type ab RR Lyrae Star DV Mon
Dambis, A. K.; Berdnikov, L. N.; Kniazev, A. Yu. +3 more
We took a total of 635 B-, V-, and Ic-band CCD frames for the RRab Lyr type variable DVMon, which has a close bright visual companion with a separation of about 1.9'. Observations were made with the 76-cm telescope of the South African Astronomical Observatory (SAAO, South Africa) using SBIG CCD ST-10XME. For the first time, we obtained…
Long-Term Activity of a Little Known Dwarf Nova DT Octantis
Šimon, V.; Edelmann, H.
We analyze the long-term activity of a little known dwarf nova (DN) DT Oct. We use photographic observations from the Bamberg Observatory (Southern Patrol Photographic Sky Survey), CCD data from ASAS-3 survey, and AAVSO data (both CCD and visual). We determined the recurrence times of the superoutbursts, TCso, and of the normal outburst…
Search for Possibly Evolutionary Linked Globular and Open Clusters
Bobylev, V. V.; Bajkova, A. T.
Based on a large sample of 133 Galactic globular clusters we obtained a new estimate of the frequency of globular-cluster impacts onto the Galactic plane, which we found to be equal to three events per 1 Myr. Our computations involving new kinematical data do not support the well-known hypothesis about the possible origin of the open cluster Steph…
SEROB1A Association in DR2 GAIA Epoch
Chentsov, E. L.
In the light of new astrometric and available spectroscopic data, the structure and kinematics of the SerOB1A association are discussed and the issue of correcting its boundaries is put.
A Comprehensive Study of 94 Open Clusters Based on the Data from IPHAS, GAIA DR2, and Other Sky Surveys
Dambis, A. K.; Yalyalieva, L. N.; Glushkova, E. V. +2 more
We determine the color excesses, photometric distances, ages, astrometric parallaxes and proper motions for 94 open clusters in the northern part of the Milky Way. We estimate the color excesses and photometric distances based on the data from IPHAS photometric survey of the northern Galactic plane using individual total-to-selective extinction ra…
Globular Clusters: Absolute Proper Motions and Galactic Orbits
Dambis, A. K.; Rastorguev, A. S.; Yalyalieva, L. N. +3 more
We cross-match objects from several different astronomical catalogs to determine the absolute proper motions of stars within the 30-arcmin radius fields of 115 Milky-Way globular clusters with the accuracy of 1–2 mas yr‑1. The proper motions are based on positional data recovered from the USNO-B1, 2MASS, URAT1, ALLWISE, UCAC5, and Gaia …
Search for Candidate Objects with the Sunyaev–Zeldovich Effect in the Radio Source Vicinities—galaxies: clusters: general
Verkhodanov, O. V.; Solovyov, D. I.; Khabibullina, M. L. +2 more
Based on the data from the Westerbork Northern Sky Survey performed at a frequency of 325 MHz in the range of right ascensions 0h ≤ α < 2h and declinations 29° < δ < 78° and using multi-frequency Planck maps, we selected candidate objects with the Sunyaev–Zeldovich effect. The list of the most probable candidates inc…
Galactic masers: Kinematics, spiral structure and the disk dynamic state
Dambis, A. K.; Bobylev, V. V.; Bajkova, A. T. +3 more
We applied the currently most comprehensive version of the statistical-parallax technique to derive the kinematical parameters of the maser sample with 136 sources. Our kinematic model comprises the overall rotation of the Galactic disk and the spiral density-wave effects, and the variation of radial velocity dispersion with Galactocentric distanc…