Kinematics and Dynamics of Galactic Stellar Populations
Author | : Rafael Cubarsi |
Publisher | : Cambridge Scholars Publishing |
Total Pages | : 223 |
Release | : 2018-07-27 |
ISBN-10 | : 9781527514805 |
ISBN-13 | : 1527514803 |
Rating | : 4/5 (05 Downloads) |
Download or read book Kinematics and Dynamics of Galactic Stellar Populations written by Rafael Cubarsi and published by Cambridge Scholars Publishing. This book was released on 2018-07-27 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stellar dynamics is an interdisciplinary field where mathematics, statistics, physics, and astronomy overlap. The approaches to studying a stellar system include dealing with the collisionless Boltzmann equation, the Chandrasekhar equations, and stellar hydrodynamic equations, which are comparable to the equations of motion of a compressible viscous fluid. Their equivalence gives rise to the closure problem, connected with the higher-order moments of the stellar velocity distribution, which is explained and solved for maximum entropy distributions and for any velocity distribution function, depending on a polynomial function in the velocity variables. On the other hand, the Milky Way kinematics in the solar neighbourhood needs to be described as a mixture distribution accounting for the stellar populations composing the Galactic components. As such, the book offers a statistical study, according to the moments and cumulants of a population mixture, and a dynamical approach, according to a superposition of Chandrasekhar stellar systems, connected with the potential function and the symmetries of the model.