The binaries and triple systems in an irregular field     

Joanna P. Anosova  Victor V. Orlov 《Astrophysics and Space Science》1989,161(2):209-220

The dynamical evolution of theN-body systems (N=6) has been studied by numerical simulations. The double and triple subsystems isolated from other bodies have been revealed. The processes of their formation, evolution, and disruption have been followed. At the initial stage of evolution, a common collapse of the system takes place. After that some fast triple approaches of single bodies are possible. At further stages, some physically connected triple subsystems are formed which are disrupted by the intruders or due to their own dynamical unstability. The dissipation mechanisms formulated by van Albada (1968) and Aarseth (1973) have been confirmed. At the final stage, double or hierarchical triple systems are formed.  相似文献   

Migration of supermassive black holes in galactic nuclei     

A. S. Kondrat’ev  V. V. Orlov 《Astronomy Letters》2008,34(8):537-541

The migration of central black holes in galactic nuclei through their encounters with galactic globular clusters is studied. The black hole moves in the field of the galactic bulge with a fixed potential. The dependences of the black-hole drift amplitude on orbital parameters of the globular cluster, its mass, and bulge parameters have been found. The drift amplitude of the central black hole can reach several parsecs in our Galaxy and several tens of parsecs in early-type (Sa) and late-type (Sc) spiral galaxies.  相似文献   

Biological Research in the Siberian Arctic Seas in Summer–Autumn 2019 (Cruise of the R/V Professor Levanidov)     

Orlov  A. M.  Gorbatenko  K. M.  Benzik  A. N.  Rybakov  M. O.  Nosov  M. A.  Orlova  S. Yu. 《Oceanology》2021,61(2):295-296

Oceanology - The article presents the results of hydrobiological, ichthyological, trophological, acoustic, and genetic research aboard the R/V Professor Levanidov in the Chukchi, East Siberian,...  相似文献   

Dynamic Cosmological Tests     

A. A. Raikov  E. A. Popova  V. V. Orlov 《Astrophysics》2018,61(4):539-545

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Studying karst relief in the Eastern Lago-Naki Plateau using LIDAR and high-resolution aerial photographs     

T. V. Orlov  S. A. Sadkov 《Water Resources》2016,43(7):1023-1033

Light Detection and Ranging scanner (LIDAR) provides precise information about the current state of relief even for densely forested areas. Ground surface point clouds were used to create raster digital elevation models (DEM) of two study areas at Lago-Naki Plateau (Krasnodar krai and the Republic of Adygea, Russia). Karst depression patterns on the plateau were examined using LIDAR-based DEM and aerial photographs. Various analysis methods were used to examine karst relief with the help of open software SAGA GIS (rasterizing LIDAR data and calculating morphometric indices) and ImageJ (Fourier transformation and two-dimensional bandpass filter functions). The current karst relief patterns were explored by methods of mathematical morphology of landscapes.  相似文献   

Planetary protection principles used for Phobos-Grunt mission     

M. B. Martynov  S. N. Alexashkin  N. M. Khamidullina  O. I. Orlov  N. D. Novikova  E. A. Deshevaya  V. I. Trofimov 《Solar System Research》2011,45(7):593-596

The article presents an analysis of the Phobos-Grunt mission, a classification of its phases in terms of planetary protection, and the main principles of activities management and definition of actions for fulfilling the planetary-protection requirements developed by Committee on Space Research.  相似文献   

Consistent patterns of the size distribution of thermokarst lakes     

A. S. Viktorov  V. N. Kapralova  T. V. Orlov  O. N. Trapeznikova  M. V. Arkhipova  P. V. Berezin  A. V. Zverev  E. N. Panchenko  S. A. Sadkov 《Doklady Earth Sciences》2017,474(2):692-694

The purpose of this work is to study empirically the patterns of size distribution of thermokarst lakes within lacustrine thermokarst plains. Investigations were performed at 16 sites with various geomorphological, geocryological, and physical geographical conditions (Kolyma Lowland, Western Siberia, Lena River valley, Alaska). The accordance of the distribution area with the lognormal and exponential laws, and the accordance of the average diameter distribution with the normal law have been tested; the tested laws of distribution resulted from previous investigations. The results have shown that the lognormal law of distribution of thermokarst lake areas is valid for the vast majority of cases, and the other types of distribution are inconsistent with empirical data. This evidence favors the development pattern for lacustrine thermokarst plains, when thermokarst processes started simultaneously and the rate of lake growth was proportional to the density of heat loss through the side surface.  相似文献   

High-velocity stars as a result of encounters between stars and massive binary black holes in galactic nuclei     

S. V. Zhuiko  V. V. Orlov  K. S. Shirokova 《Astronomy Reports》2017,61(1):47-52

Numerical simulations of the motions of stars in the gravitational fields of binary black holes with various component mass ratios have been carried out. Two models are considered: (1) the two-body problem with two fixed centers; (2) the general three-body problem. The first model is applicable only over short times Δt ? T, where T is the period of the binary system. The second model is applicable at all times except for during close encounters of stars with one of the binary components, r ≤ 0.00002 pc, where r is the distance from the star to the nearer black hole. In very close passages, relativistic corrections must be taken into account. Estimates of the probability of formation of high-velocity stars as a result of such interactions are obtained. It is shown that this mechanism is not suitable for the nucleus of our Galaxy due to the probable absence of a second massive black hole in the central region of the Galaxy.  相似文献   

The structure of non-hierarchical triple system stability regions     

A. I. Martynova  V. V. Orlov  A. V. Rubinov 《Astronomy Reports》2009,53(8):710-721

A detailed study of the two-dimensional initial conditions region section in the planar three-body problem is performed. The initial conditions for the three well-known stable periodic orbits (the Schubart’s orbit, the Broucke’s orbit and the eight-like orbit) belong to this section. Continuous stability regions (for the fixed integration interval) generated by these periodic orbits are found. Zones of the quick stability violation are outlined. The analysis of some concrete trajectories coming from various stability regions is performed. In particular, trajectories possessing varying number of “eights” formed by moving triple system components are discovered. Orbits with librations are also found. The new periodic orbit originated from the zone siding with the Schubart’s orbit region is discovered. This orbit has reversibility points (each of the outer bodies possess a reversibility point) and two points of close double approach of the central body to each of the outer bodies. The influence of the numerical integration accuracy on the results is studied. The stability regions structure is preserved during calculations with different values of the precision parameter, numerical integration methods and regularization algorithms of the equations of motion.  相似文献   

Physical parameters and dynamical properties of the multiple system ι UMa (ADS 7114)     

R. Ya. Zhuchkov  E. V. Malogolovets  O. V. Kiyaeva  V. V. Orlov  I. F. Bikmaev  Yu. Yu. Balega 《Astronomy Reports》2012,56(7):512-523

We analyze the physical parameters, orbital elements, and dynamic stability of the multiple system ?? UMa (HD 76644 = ADS 7114). We have used the positions from the WDS catalog and our own observations on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences and the 1.5-m Russian-Turkish Telescope (Antalya, Turkey). We have obtained more precise orbital parameters of the subsystems, and spectral types, absolute magnitudes, and masses of the components. The primary has Sp = F0 V?CIV, M = 1.7 ± 0.1M _??, T _eff = 7260 ± 70 K, and log g = 4.30 ± 0.07. The companion in the close Aa subsystem is most likely a white dwarf with a mass of approximately 1.0 ± 0.3M _??. The spectral types and masses of the components in the BC subsystem are M3V, M4V and 0.35 ± 0.05M _??, 0.30 ± 0.05M _??, respectively. The total mass is 3.4 ± 0.4M _??. The Aa subsystem probably has an orbital period of 4470^d = 12.2^y and an eccentricity of approximately 0.6. The outer subsystem seems to have a period of approximately 2084 yrs and an eccentricity of approximately 0.9. We have carried out simulations using the stability criteria and shown that for all possible variations in the component parameters, the multiple system is unstable on a time scale of less than 10⁶ years with a probability exceeding 0.98. Possible reasons for this instability are discussed.  相似文献