105 Result(s)

Article

Gasdynamical Treatment of Mass Transfer in Symbiotic Stars

The results of two-dimensional, non-adiabatic gas dynamical simulations of gas flows in symbiotic stars are presented. It is shown that for a binary system with components that do not fill their Roche lobes, t...

D.V. Bisikalo, A.A. Boyarchuk, V.M. Chechetkin… in Astrophysics and Space Science (1997)

Article

The effect of viscosity on the flow morphology in semidetached binary systems. Results of 3D simulations. II

We present the results of three-dimensional simulations of matter flows in semidetached binary systems with various viscosities. In low-viscosity systems, the flow structure displays the same qualitative featu...

D. V. Bisikalo, A. A. Boyarchuk, O. A. Kuznetsov, V. M. Chechetkin in Astronomy Reports (2000)

Article

Nonconservative evolution of cataclysmic binaries

We present a mechanism to take into account angular-momentum loss in binary systems with non-conservative mass transfer. In a number of cases, mass loss in the system can increase the orbital angular momentum ...

A. V. Fedorova, D. V. Bisikalo, A. A. Boyarchuk, O. A. Kuznetsov… in Astronomy Reports (2000)

Article

Interpretation of light curves of IP Peg in a model with shockless interaction between the gas stream and disk

We have analyzed light curves of the eclipsing cataclysmic variable IP Peg. A model with a shockless interaction between the gaseous stream and disk (i.e., an elliptical disk with a “hot line”) can describe th...

T. S. Khruzina, A. M. Cherepashchuk, D. V. Bisikalo, A. A. Boyarchuk… in Astronomy Reports (2001)

Article

The structure of matter flows in semi-detached binaries after the termination of mass transfer

We present the results of three-dimensional gas-dynamical simulations of matter flows in semi-detached binaries after termination of the mass transfer between the components of the system. The structure of the...

D. V. Bisikalo, A. A. Boyarchuk, A. A. Kil’pio, O. A. Kuznetsov… in Astronomy Reports (2001)

Article

A possible manifestation of spiral shock waves in the accretion disks of cataclysmic variables

We present the results of three-dimensional numerical simulations of flow structures in binary systems with spiral shock waves. Variations of the mass-transfer rate perturb the equilibrium state of the accreti...

D. V. Bisikalo, A. A. Boyarchuk, A. A. Kilpio, O. A. Kuznetsov in Astronomy Reports (2001)

Article

Synthetic Doppler tomograms of gas flows in the binary system IP Peg

We have synthesized Doppler tomograms of gas flows in the binary system IP Peg using the results of three-dimensional gas-dynamical computations. Gas-dynamical modeling in combination with Doppler tomography e...

O. A. Kuznetsov, D. V. Bisikalo, A. A. Boyarchuk, T. S. Khruzina… in Astronomy Reports (2001)

Article

Structure of gas flows in Z And in quiescence and during outbursts

A new mechanism is proposed to account for transitions between the quiescent and active states of symbiotic stars. A numerical study of the gas dynamics of the flows in the symbiotic star Z And shows that even...

D. V. Bisikalo, A. A. Boyarchuk, E. Yu. Kilpio, O. A. Kuznetsov in Astronomy Reports (2002)

Chapter

Summary of Quantitative Interpretation of IMAGE Far Ultraviolet Auroral Data

Direct imaging of the magnetosphere by instruments on the IMAGE spacecraft is supplemented by simultaneous observations of the global aurora in three far ultraviolet (FUV) wavelength bands. The purpose of the ...

H. U. Frey, S. B. Mende, T. J. Immel… in Magnetospheric Imaging — The Image Prime M… (2003)

Article

Interpretation of light curves of the cataclysmic variable OY Car in a model with shockless interaction between a gaseous stream and the disk

To determine the parameters of the accretion disk and shock-wave region responsible for the formation of the orbital peak in the light curve of the binary system OY Car (an SU UMa-type variable), we have analy...

T. S. Khruzina, A. M. Cherepashchuk, D. V. Bisikalo, A. A. Boyarchuk… in Astronomy Reports (2003)

Article

Light curve interpretation for “Quiescent” X-ray novae in a model with noncollisional interaction between the flow and disk. The system GU Mus = GRS 1124-68

We have analyzed optical and infrared light curves of GU Mus obtained during the system's quiescent state and carried out computations for “hot-line” and “hot-spot” models. The hot-line model describes the opt...

T. S. Khruzina, A. M. Cherepashchuk, D. V. Bisikalo, A. A. Boyarchuk… in Astronomy Reports (2003)

Article

Morphology of the interaction between the stream and cool accretion disk in a semidetached binary system

We analyze heating and cooling processes in accretion disks in binaries. For realistic parameters of the accretion disks in close binaries ( ...

D. V. Bisikalo, A. A. Boyarchuk, P. V. Kaigorodov, O. A. Kuznetsov in Astronomy Reports (2003)

Article

Interpretation of orbital light curves of U Geminorum

We interpret optical and IR orbital light curves of the dwarf nova U Gem in its quiescent state in the framework of “hot line” and “hot spot” models. The hot-line model provides an adequate fit to the light cu...

T. S. Khruzina, A. M. Cherepashchuk, D. V. Bisikalo, A. A. Boyarchuk… in Astronomy Reports (2003)

Article

The structure of cool accretion disks in semidetached binaries

We present a qualitative analysis of possible changes in the structure of accretion disks that occur in the transition from hot to cool disks. We suggest that an additional spiral-density wave can exist in the...

D. V. Bisikalo, A. A. Boyarchuk, P. V. Kaigorodov, O. A. Kuznetsov… in Astronomy Reports (2004)

Article

A model for superoutbursts in SU UMa-type binaries

We suggest a new mechanism for the superoutbursts in SU UMa binaries, in which the increase in the accretion rate resulting in a superoutburst is associated with the formation of a spiral “precessional” wave i...

D. V. Bisikalo, A. A. Boyarchuk, P. V. Kaigorodov, O. A. Kuznetsov… in Astronomy Reports (2004)

Article

Interpretation of the light curves of “quiescent” X-ray novae in a model with a noncollisional interaction between the flow and disk. The XTE J1118+480 system

We have analyzed the orbital light curve of the X-ray nova XTE J1118+480 in a “disk + hot line” model based on three-dimensional gas-dynamical computations of gas flows in interacting binary systems. As a resu...

T. S. Khruzina, A. M. Cherepashchuk, D. V. Bisikalo, A. A. Boyarchuk… in Astronomy Reports (2005)

Article

Numerical Modeling of Mass Transfer in Close Binaries

The review of gasdynamic models used for the description of the mass exchange in close binaries is presented. Main features of the flow structure are summarized. Special attention is paid to physics of accreti...

D. V. Bisikalo in Astrophysics and Space Science (2005)

Article

The possible nature of dips in the light curves of semidetached binaries with stationary disks

A thickening at the outer edge of the accretion disk is usually invoked to explain the dips in the light curves of cataclysmic variables with stationary disks at phases ∼0.7. The noncollisional interaction bet...

D. V. Bisikalo, P. V. Kaigorodov, A. A. Boyarchuk, O. A. Kuznetsov in Astronomy Reports (2005)

Article

Three-dimensional gas-dynamical modeling of changes in the flow structure during the transition from the quiescent to the active state in symbiotic stars

The results of three-dimensional modeling of the flow structure in the classical symbiotic system Z Andromedae are presented. Outbursts in systems of this type occur when the accretion rate exceeds the upper l...

M. Mitsumoto, B. Jahanara, T. Matsuda, K. Oka, D. V. Bisikalo… in Astronomy Reports (2005)

Chapter and Conference Paper

The Morphology of Gaseous Flows in Z and in the Active State

E. Yu. Kilpio, D. V. Bisikalo, A. A. Boyarchuk, O. A. Kuznetsov in Astrophysical disks (2006)