Search Publications
KDG218, a nearby ultra-diffuse galaxy
Sharina, M. E.; Karachentsev, I. D.; Makarova, L. N. +1 more
We present properties of the low-surface-brightness galaxy KDG218 observed with the HST/ACS. The galaxy has a half-light (effective) diameter of ae = 47″ and a central surface brightness of SBV(0) = 24.m4/□″. The galaxy remains unresolved with the HST/ACS, which implies its distance of D > 13.1 Mpc and linear ef…
IR photometry results and dust envelope model for symbiotic Mira star candidate V 335 Vul
Bogdanov, M. B.; Taranova, O. G.; Shenavrin, V. I.
We present the results of JHKLM-photometry for the symbiotic Mira star candidate V 335 Vul. Based on the average flux data, supplemented by IRAS, MSX, AKARI, and WISE mid-IR observations, we calculated a model of a spherically symmetric dust envelope of the star, made up of amorphous carbon and silicon carbide particles. The optical depth of the e…
A comparison of properties of different population radio galaxies based on the Planck mission microwave data
Verkhodanov, O. V.; Solovyov, D. I.; Khabibullina, M. L. +1 more
Applying the stacking method, we examine the areas of the cosmic microwave background radiation (CMB) maps, constructed according to the Planck SpaceObservatory data in the neighbourhood of different populations of radio sources and giant elliptical galaxies. The samples of objects include giant radio galaxies (GRG), radio sources, selected by the…
A comparison of anisotropic statistical properties of CMB maps based on the WMAP and planck space mission data
Verkhodanov, O. V.; Naiden, Ya. V.
We compare the anisotropic properties of the cosmic microwave background (CMB) maps constructed based on the data of NASA's WMAP (9th year of observations) and ESA's Planck (2015 release) space missions. In our analysis, we use two two-dimensional estimators of the scatter of the signal on a sphere, which amount to algorithms of mapping the ratio …
Investigation of the RCR catalog sources in the millimeter and submillimeter ranges based on the Planck mission data
Verkhodanov, O. V.; Majorova, E. K.; Zhelenkova, O. P. +3 more
We have studied the regions of the microwave background radiation maps of the Planck experiment in the neighborhood of the RCR catalog radio sources. From the processed data for bright radio sources in the microwave range, we plotted the calibration curves which allow the brightness of the objects to be measured. For the first time, for 117 object…
On discovery of strong magnetic field in the binary system HD34736
Romanyuk, I. I.; Semenko, E. A.; Yakunin, I. A. +1 more
We present the results of a study of the star HD34736. The spectropolarimetric observations carried out at the 6-m telescope showed the presence of a strong variable longitudinal magnetic field, exceeding ‑4500 G. The analysis of the Hipparcos photometry gives a set of possible periods of the brightness variability of the star, of which
Physical and geometrical parameters of the binary system gliese 150.2
Al-Wardat, M. A.; Balega, Yu. Yu.; Leushin, V. V. +4 more
The speckle interferometric binary system Gl 150.2 (HIP17491) is analyzed using atmosphere modeling and dynamical analysis simultaneously. A synthetic spectral energy distribution (SED) for each of the two components of the system is built using Kurucz blanketed models. These SEDs are combined together to form the total flux, which is compared wit…
Comparison of low-harmonics spectra and maps according to the WMAP and Planck space missions
Verkhodanov, O. V.
We present a comparison of the angular power spectra and maps represented by the WMAP and Planck mission teams. The spectra are compared in the the multi pole range (2 ≤ ℓ ≤ 50). The ℓ =5, 7, 13, 29, 37, 41–46 harmonics have a discrepancy in the angular power spectra. The maps of the microwave background and their phase characteristics are studied…
Two-dimensional spectral estimators of statistical anisotropy and search for the isolated directions in Planck mission data
Verkhodanov, O. V.; Naiden, Ya. V.
We describe a method for the analysis of homogeneity of the microwave background maps based on the behavior of the angular power spectrum C(ℓ) and parity parameter P. The estimator is built using the dispersion variation of the power spectrum of the background signal hemisphere and allows to visualize the statistical anisotropy as a new map which …
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…