Stellar dynamics is the research area within astrophysics that investigates the gravitational interactions, phase-space evolution, and collective behavior of stellar systems such as star clusters, galactic disks, and spheroidal components. It employs N-body simulations, kinetic theory (e.g., the Boltzmann and Vlasov equations), and perturbation methods to study relaxation processes, resonances, instabilities, and secular evolution driven by both collisional and collisionless effects. Stellar dynamics underpins quantitative models of mass distributions, dark matter inference from stellar kinematics, formation and survival of bound structures, and the dynamical impact of central massive black holes and external tidal fields on stellar systems.
For centuries, astronomers have sought to understand the formation and evolution of the solar system and the dynamics that govern it. In particular, there is the long-standing question of whether or not the planets' orbits ...
Astronomy
Jun 2, 2025
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Wide binary stars with separation greater than about 2000 astronomical units are interesting natural laboratories that allow a direct probe of gravity at low acceleration weaker than about 1 nanometer per second squared. ...
Astronomy
May 27, 2025
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Observations from NASA's James Webb Space Telescope have provided a surprising twist in the narrative surrounding what is believed to be the first star observed in the act of swallowing a planet. The new findings, published ...
Astronomy
Apr 10, 2025
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189
A team led by Satoya Nakano and Kengo Tachihara at Nagoya University in Japan has revealed new insights into the motion of massive stars in the Small Magellanic Cloud (SMC), a small galaxy neighboring the Milky Way.
Astronomy
Apr 10, 2025
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145
Physicists have proposed a solution to a long-standing puzzle surrounding the GD-1 stellar stream, one of the most well-studied streams within the galactic halo of the Milky Way, known for its long, thin structure, and unusual ...
Astronomy
Jan 7, 2025
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By peering into the cosmic dance of stars, a team led by researchers from the Leibniz Institute for Astrophysics Potsdam (AIP) has unraveled the complex structure of our Milky Way galaxy. Assuming that each observed star ...
Astronomy
Dec 19, 2024
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68
When a star moves around a supermassive black hole (SMBH) in a close elliptical orbit, it gets partially tidally disrupted every time it reaches the pericenter, emitting a series of luminous flares, known as a partial tidal ...
Astronomy
Nov 11, 2024
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A study published in Astronomy & Astrophysics marks a significant milestone in our understanding of the formation and dynamical evolution of multiple stellar populations in globular clusters (spherical and very compact stellar ...
Astronomy
Nov 5, 2024
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142
Based on the data from the Magellan-Clay telescope in Chile, astronomers have performed a chemo-dynamical study of a very metal-poor star known as HE 2315−4240. Results of the study, published on the preprint server arXiv, ...
Why is it important to search for exoplanets in triple star systems and how many can we find there? This is what a recent study accepted by Astrophysics & Space Science hopes to address after a pair of researchers from the ...
Astrobiology
Oct 2, 2024
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