Search Publications
Speckle interferometry of nearby multiple stars. V. 2002–2006 positional measurements
Dyachenko, V. V.; Rastegaev, D. A.; Balega, Yu. Yu. +5 more
We present the measurements of positional parameters of 194 nearby binary stars performed at the 6-m BTA telescope of the SAO RAS from 2002 through 2006 applying the speckle interferometric technique. The observations were conducted at central filter wavelengths ranging from 545 to 800 nm using a speckle interferometer equipped with a fast CCD and…
Ultra-luminous X-ray sources as supercritical accretion disks: Spectral energy distributions
Vinokurov, A.; Atapin, K.; Fabrika, S.
We describe a model of spectral energy distribution in supercritical accretion disks (SCAD) based on the conception by Shakura and Sunyaev. We apply this model to five ultra-luminous X-ray sources (ULXs). In this approach, the disk becomes thick at distances to the center less than the spherization radius, and the temperature dependence is T ∝ r
Distances to dwarf galaxies of the Canes Venatici I cloud
Makarova, L. N.; Makarov, D. I.; Uklein, R. I.
We determined the spatial structure of the scattered concentration of galaxies in the Canes Venatici constellation. We redefined the distances for 30 galaxies of this region using the deep images from the Hubble Space Telescope archive with the WFPC2 and ACS cameras.We carried out a high-precision stellar photometry of the resolved stars in these …
Stars with discrepant v sin i as derived from the Ca II λ3933 Å and Mg II λ4481 Å lines. IV. HD8837—a shell star, HD47964 and HD183986—new binaries
Stateva, I.; Semenko, E.; Kudryavtsev, D. +4 more
Axial rotation of a star plays an important role in its evolution, physical conditions in its atmosphere, and appearance of its spectrum. We have analyzed CCD spectra of three stars for which their projected rotational velocity remarkably differs when derived from the Ca II λ 3933 Å and MgII λ 4481 Å lines. We derived effective temperatures and su…