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Kinematics and Dynamics of Galactic Stellar Populations

2018-07-27 Science
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Release : 2018-07-27
Genre : Science
Kind : eBook
Book Rating : 803/5 ( reviews)

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Book Synopsis Kinematics and Dynamics of Galactic Stellar Populations by : Rafael Cubarsi

Download or read book Kinematics and Dynamics of Galactic Stellar Populations written by Rafael Cubarsi. This book was released on 2018-07-27. 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.

Dynamics of Young Star Clusters and Associations

2015-09-11 Science
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Release : 2015-09-11
Genre : Science
Kind : eBook
Book Rating : 902/5 ( reviews)

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Book Synopsis Dynamics of Young Star Clusters and Associations by : Cathie Clarke

Download or read book Dynamics of Young Star Clusters and Associations written by Cathie Clarke. This book was released on 2015-09-11. Available in PDF, EPUB and Kindle. Book excerpt: Where do most stars (and the planetary systems that surround them) in the Milky Way form? What determines whether a young star cluster remains bound (such as an open or globular cluster), or disperses to join the field stars in the disc of the Galaxy? These questions not only impact understanding of the origins of stars and planetary systems like our own (and the potential for life to emerge that they represent), but also galaxy formation and evolution, and ultimately the story of star formation over cosmic time in the Universe. This volume will help readers understand our current views concerning the answers to these questions as well as frame new questions that will be answered by the European Space Agency's Gaia satellite that was launched in late 2013. The book contains the elaborated notes of lectures given at the 42nd Saas-Fee Advanced Course “Dynamics of Young Star Clusters & Associations" by Cathie Clarke (University of Cambridge) who presents the theory of star formation and dynamical evolution of stellar systems, Robert Mathieu (University of Wisconsin) who discusses the kinematics of star clusters and associations, and I. Neill Reid (S pace Telescope Science Institute) who provides an overview of the stellar populations in the Milky Way and speculates on from whence came the Sun. As part of the Saas-Fee Advanced Course Series, the book offers an in-depth introduction to the field serving as a starting point for Ph.D. research and as a reference work for professional astrophysicists.

Galactic Astronomy

2021-07-13 Science
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Release : 2021-07-13
Genre : Science
Kind : eBook
Book Rating : 322/5 ( reviews)

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Book Synopsis Galactic Astronomy by : James Binney

Download or read book Galactic Astronomy written by James Binney. This book was released on 2021-07-13. Available in PDF, EPUB and Kindle. Book excerpt: This is the definitive treatment of the phenomenology of galaxies--a clear and comprehensive volume that takes full account of the extraordinary recent advances in the field. The book supersedes the classic text Galactic Astronomy that James Binney wrote with Dimitri Mihalas, and complements Galactic Dynamics by Binney and Scott Tremaine. It will be invaluable to researchers and is accessible to any student who has a background in undergraduate physics. The book draws on observations both of our own galaxy, the Milky Way, and of external galaxies. The two sources are complementary, since the former tends to be highly detailed but difficult to interpret, while the latter is typically poorer in quality but conceptually simpler to understand. Binney and Merrifield introduce all astronomical concepts necessary to understand the properties of galaxies, including coordinate systems, magnitudes and colors, the phenomenology of stars, the theory of stellar and chemical evolution, and the measurement of astronomical distances. The book's core covers the phenomenology of external galaxies, star clusters in the Milky Way, the interstellar media of external galaxies, gas in the Milky Way, the structure and kinematics of the stellar components of the Milky Way, and the kinematics of external galaxies. Throughout, the book emphasizes the observational basis for current understanding of galactic astronomy, with references to the original literature. Offering both new information and a comprehensive view of its subject, it will be an indispensable source for professionals, as well as for graduate students and advanced undergraduates.

Dynamics of Stellar Systems

2016-10-13 Science
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Release : 2016-10-13
Genre : Science
Kind : eBook
Book Rating : 457/5 ( reviews)

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Book Synopsis Dynamics of Stellar Systems by : K. F. Ogorodnikov

Download or read book Dynamics of Stellar Systems written by K. F. Ogorodnikov. This book was released on 2016-10-13. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Stellar Systems focuses on the theoretical problems in stellar dynamics. The book first offers information on stellar dynamics, including historical development, fundamentals of synthetic method, and value of stellar dynamics. The text discusses the fundamental concepts of stellar statistics. Properties of univariate distribution functions; multivariate distribution functions; and statistical properties of stars are explained. The text then describes the elementary theory of galactic rotation and irregular forces in stellar systems. The text also tackles statistical stellar dynamics of neglecting encounters. Considerations include Boltzmann equation in curvilinear coordinates; importance of using one-valued integrals of the motion; and fundamental differential equation of stellar dynamics. The book also underscores the regular orbit of stars and dynamics of centroids. The text describes the dynamics of spherical stellar and rotating stellar systems. The theory of polytropic spheres; basic equations for spherical systems; masses and rotation of galaxies; and boundaries of galaxies are discussed. The text is highly recommended for readers interested in stellar dynamics.

Structure and Kinematics of the Milky Way as Seen from Barred Galactic Model

2017
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Release : 2017
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Book Rating : /5 ( reviews)

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Book Synopsis Structure and Kinematics of the Milky Way as Seen from Barred Galactic Model by : José Fernandez Trincado

Download or read book Structure and Kinematics of the Milky Way as Seen from Barred Galactic Model written by José Fernandez Trincado. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: This work of thesis concerns an in detailed study of the structure, kinematics and dynamics of the Milky Way,with a particular emphasis on the bulge region and the halo. The main goal of this work is to establish dynamicalconstraints on the physical parameters of the Galactic bar in order to construct a detailed kinematic maps of the innerregions of the our Galaxy. Such map can be used as an ingredient for the Besançon stellar populations synthesismodel, allowing to provide accurate kinematic simulations in the inner regions of the disk and in the bar itself.In this thesis I present several analytic and semi-analytic potentials to approximate the 3D gravitational potentialmodel of the Milky Way, observationally and dynamically constrained, where the perturbations produced by theGalactic bar fit fairly well the global kinematic trends in the Galactic bulge. Using ~10 millions massless particles as tracers of stellar kinematics, we present a full study of the orbits in the bar, and non-stationary effects of the bar on the disks and the halo. In particular we trace the kinematic imprints of disk particles trapped/scattered in the Galactic bar. Finally, we analyse the orbits of chemically peculiar stars in the Milky Way field and its relation with globular clusterstars from the analysis of spectroscopic data. These results confirm previous claims that a small fraction of the Galactichalo is made up of light-element abundance patterns observed only in the globular clusters environments. Theyprovide a crucial observational support to the "merging" scenario of the Milky Way bulge region as well as in thehalo. We develop a method to compute the stellar kinematics and orbits inferred from the density profiles and the gravitational potential for several stellar populations. As a by product of this thesis, we provide the GravPot16 package, a software designed for Galactic dynamics, and orbit integration. Also taking advantage of high quality data produced by the first data release of the mission Gaia (TGAS) combined with accurate chemical information from the APOGEE datasets, I present preliminary results of the Chemo-orbital properties of the Milky Way.

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