Stellar Dynamics


Also found in: Wikipedia.

Stellar Dynamics

 

a branch of stellar astronomy that studies the regularities in the motions of stars in the gravitational field of a stellar system and, consequently, the evolution of stellar systems.

The methods of analytic mechanics and statistical physics are combined in stellar dynamics. The means of analytic mechanics alone are insufficient, since the number of stars in stellar systems (excluding multiple stars) is great. Although galaxies contain, in addition to stars, some dust and gas (the motion of which is determined not only by gravitational forces but also by forces of light pressure as well as by forces from the magnetic field of the stellar system), the principal problem of stellar dynamics is the study of the motions of stars, since it is in stars that most of the matter of galaxies is concentrated. The basic types of stellar systems studied in stellar dynamics are galaxies, particularly the Milky Way Galaxy. Globular and open clusters, multiple stars, and clusters of galaxies are also investigated.

An important problem of stellar dynamics in the mid-20th century is the problem of relaxation, which is linked to the investigation of the possible paths that the evolution of stellar systems can take from certain initial states to the state characterized by the stellar velocity distribution observable in the present era. The problem of spiral and ring structures in galaxies occupies an important place in the investigations of stellar dynamics.

References in periodicals archive ?
Another 10 reviews update readers on such astronomical and astrophysical matters as stellar dynamics and stellar phenomena near a massive black hole, observing interstellar and intergalactic magnetic fields, Markov chain Monte Carlo methods for Bayesian data analysis in astronomy, ultra-luminous X-ray sources, and how to characterize habitable worlds and signs of life.
AMUSE is a software framework in which existing codes--modeling stellar dynamics, stellar evolution, hydrodynamics, and radiative transfer--can be used simultaneously.
In particular, he extends the field to include radiation processes, hydrodynamics, plasma physics and magneto-hydrodynamics, and stellar dynamics.
Max Schurer born; Director of the Astronomical Institute of Berne University; studied the orbits of the asteroids, stellar dynamics, and satellite geodesy.
The centre of the Galaxy is a unique laboratory where we can study the fundamental processes of strong gravity, stellar dynamics and star formation that are of great relevance to all other galactic nuclei, with a level of detail that will never be possible beyond our Galaxy," explained Reinhard Genzel, leader of the team from the Max-Planck-Institute for Extraterrestrial Physics.
GE Harris Energy Control Systems, LLC has acquired Stellar Dynamics Incorporated, an electrical utility and industrial automation and control engineering company based in Boise, Idaho.
Stellar Dynamics, formerly owned by Idaho Power Company, is a leading expert in providing integrated protection, control, and automation solutions based upon multi-vendor equipment.
The 94 papers that emerged cover the interstellar content of the galactic center region; star formation, young stars, and HII regions in the central molecular zone; stellar dynamics and stellar distributions in the presence of the galactic black hole; the supermassive black hole and accretion onto Sagittarius A*; high-energy diagnostics of galactic nuclear activity; and supermassive black holes and stellar feedback in nuclear environments.
Chandra next went into the field of stellar dynamics.
The 39 papers here cover nebulae, stellar dynamics, radiative transfer, interstellar absorption, and miscellaneous topics.
They now serve as laboratories for theories of stellar dynamics and evolution.