scholarly journals Wind accretion in close binary systems: a 3D smoothed particle hydrodynamics simulation of disc structure and dynamics

1997 ◽  
Vol 284 (4) ◽  
pp. 957-966 ◽  
Author(s):  
G. Lanzafame ◽  
G. Belvedere
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Binary Systems ◽  
Close Binary ◽  
Structure And Dynamics ◽  
Close Binary Systems ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals Mass Transfer in Binary Systems: A Numerical Approach

2007 ◽  
Vol 3 (S246) ◽  
pp. 271-272
Author(s):  
C.-P. Lajoie ◽  
A. Sills
Keyword(s):  
Mass Transfer ◽  
Smoothed Particle Hydrodynamics ◽  
Binary Systems ◽  
Numerical Approach ◽  
Central Point ◽  
Point Mass ◽  
Blue Straggler ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Transfer Flow

AbstractWe present preliminary work on the formation scenario of blue straggler stars by mass transfer in binary systems. More precisely, using Smoothed Particle Hydrodynamics (SPH), we want to model only the outer parts of the stars in order to get a much greater spatial resolution of the mass transfer flow itself. The inner boundary conditions are achieved using the so-called ghost particles and by replacing the inner mass by a central point mass. Stability of this central point mass is crucial, and it is shown that we get reasonable results. These simulations should give us indications on which layers of the donor star are actually transferred to the other star as well as how mass is transferred and how it settles on the accretor. This work is aimed at getting distinct observational signatures which would help identifying the dominant formation mechanism of blue straggler stars.

INVESTIGATION OF RADIATIVE OUTFLOWS AROUND COMPACT OBJECTS

2000 ◽  
Vol 09 (01) ◽  
pp. 57-69 ◽  
Author(s):  
INDRANIL CHATTOPADHYAY ◽  
SANDIP K. CHAKRABARTI
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Smoothed Particle Hydrodynamics ◽  
Binary Systems ◽  
Active Galaxies ◽  
Compact Objects ◽  
Accretion Discs ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Radiative Acceleration

Winds and outflows form in active galaxies and in binary systems which are known to harbour compact objects such as black holes. Matter starting subsonically from a disc must be accelerated very close to the black hole in order to reach a velocity comparable to the velocity of light, which is actually observed. In the absence of magnetic fields, winds forming in inner regions of accretion discs could primarily be accelerated by radiations emitted from this region where centrifugal force is important. We study critical point behaviour of outflows in presence of this radiative acceleration. We show that the momentum deposition term changes the character of the solution drastically depending on the magnitude and the location of the deposition. We discuss the implications of these solutions in detail. Particularly important is the fact that matter were found to be pushed to infinity, even when they were originally bound energetically. We perform numerical simulations by smoothed particle hydrodynamics (SPH), and show that these new solutions are stable.

scholarly journals Hydrodynamic Modelling of Accretion Flows

2004 ◽  
Vol 194 ◽  
pp. 166-168
Author(s):  
J. R. Murray ◽  
M. R. Truss ◽  
S. B. Foulkes ◽  
C. A. Haswell ◽  
K. J. Manson
Keyword(s):  
Accretion Disks ◽  
Smoothed Particle Hydrodynamics ◽  
Numerical Scheme ◽  
Close Binary ◽  
Hydrodynamic Modelling ◽  
Accretion Flows ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

AbstractIn the proceedings of this, and of several recent close binary conferences, there have been several contributions describing smoothed particle hydrodynamics simulations of accretion disks. It is opposite therefore to review the numerical scheme itself with emphasis on its advantages for disk modelling, and the methods used for modelling viscous processes.

scholarly journals Self-gravitating disks in binary systems: an SPH approach

2019 ◽  
Vol 628 ◽  
pp. A82
Author(s):  
L. D. Pinto ◽  
R. Capuzzo-Dolcetta ◽  
G. Magni
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Binary Systems ◽  
Open Clusters ◽  
Star Mass ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Sph Algorithm ◽  
The Stability ◽  
Self Gravity

The study of the stability of massive gaseous disks around a star in a nonisolated context is a difficult task and becomes even more complicated for disks that are hosted by binary systems. The role of self-gravity is thought to be significant when the ratio of the disk-to-star mass is non-negligible. To solve these problems, we implemented, tested, and applied our own smoothed particle hydrodynamics (SPH) algorithm. The code (named GaSPH) passed various quality tests and shows good performances, and it can therefore be reliably applied to the study of disks around stars when self-gravity needs to be accounted for. We here introduce and describe the algorithm, including some performance and stability tests. This paper is the first part of a series of studies in which self-gravitating disks in binary systems are let evolve in larger environments such as open clusters.

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

Simulations of slug impact with smoothed particle hydrodynamics: Some remarks on frequently asked questions

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-427-Pr9-432
Author(s):  
P. Galon ◽  
H. Bung ◽  
M. Lepareux ◽  
T. Grünenwald
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Simulation de l'écoulement au cours du procédé de rotomoulage par la méthode Smoothed Particle Hydrodynamics (SPH)

2008 ◽  
Vol 96 (6) ◽  
pp. 263-268 ◽  
Author(s):  
E. Mounif ◽  
V. Bellenger ◽  
A. Ammar ◽  
R. Ata ◽  
P. Mazabraud ◽  
...  
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle
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