Dynamics of Star Clusters

Proceeding of the 113th Symposium of the International Astronomical Union, held in Princeton, New Jersey, U.S.A, 29 May – 1 June, 1984

Author: Jeremy Goodman

Publisher: Springer Science & Business Media

ISBN:

Category: Science

Page: 644

View: 130

The emphasis in these proceedings of lAD Symposium No. 113, Dynafrri-,'!s of Star Clusters. and·.~.Le. mab rPIHlon for orZ'lnizinp: thE" symposium in the spring of 1984, was the rapid increase during the preceeding year in our understanding of core collapse. The last I.A.D. Symposium to discuss the dynamics of star clusters at length was No.69, Dynamics of Stellar Systems~ held in Besan~on in 1974. For a few years afterwards, globular clusters receiveu much attention due to the discovery of X-ray bursters and the mounting evidence that X-ray sources in globular clusters were formed in completely different ways than those within our galaxy. Globular clusters, which until this time had a reputation for sedate old age, turned out to lead violent private lives at high energies. However, in the early 80's globular clusters seemed to lose some of the glamor of the 70's. The grand speculations of heavy black holes lurking in their centers had to make way for a variety of observational evidence which indicated that the X-ray sources are low-mass close binaries instead. But, though dynamical fashion turned to heavy galac tic halos and so on, some of the unsolved theoretical problems regard ing the evolution of star clusters kept their fascination for a number of relatively isolated workers. After several years of inconspicuous labor, a number of preprints suddenly appeared in the spring of 1983 that studied the evolution of globular clusters after core collapse.

Symmetries and Dynamics of Star Clusters

Author: Jaroslav Haas

Publisher: Springer Science & Business Media

ISBN:

Category: Science

Page: 79

View: 283

In this PhD thesis, which was nominated for publication in this series by the Astronomical Institute at Charles University, Prague, the author investigates the orbital evolution of an initially thin stellar disc around a supermassive black hole, considering various perturbative sources of gravity. His findings, obtained by both direct numerical N-body modelling and using standard perturbation methods, offer a viable theoretical explanation for the observed configuration of young stars in the Galactic Centre. This marks a significant contribution to a topic of great interest in contemporary astrophysics. The author also shows in his thesis that a secular instability (m = 1 mode) may occur in the embedding spherical cluster of old stars. This increases the richness of possible evolution scenarios of the embedding cluster and may lead to effective feeding of supermassive black holes through tidal disruption of stars on extremely eccentric orbits.

Dynamics of Young Star Clusters and Associations

Saas-Fee Advanced Course 42. Swiss Society for Astrophysics and Astronomy

Author: Cathie Clarke

Publisher: Springer

ISBN:

Category: Science

Page: 348

View: 297

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.

Dynamics of Star Clusters and the Milky Way

Proceedings of the International Spring Meeting of Astronomische Gesellschaft to Celebrate the 300th Anniversary of the "Calendar Edict" Foundation Document of Astronomisches Rechen-Institut Held in Heidelberg, Germany, 20-24 March 2000

Author: Astronomische Gesellschaft (Germany). Meeting

Publisher: Astronomical Society of the pacific

ISBN:

Category: Science

Page: 648

View: 713

Annotation Papers from a March 2000 meeting report on challenges in the areas of stellar dynamics, computing, and observations of the Milky Way, star clusters, and dense stellar systems in active galactic nuclei. Subjects discussed include star cluster dynamics, direct N-body simulation, structure and potential of the Galaxy as a whole and of the solar neighborhood, the Galaxy's nucleus, satellites, and disk dynamics, and its globular cluster system. Some specific paper topics include Monte Carlo simulations of globular cluster dynamics, stellar collisions in the galactic center, faint moving objects of the dark halo, and cross-dynamics of open clusters in the Galaxy. This work lacks a subject index. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Star Clusters (IAU S266)

Basic Galactic Building Blocks Throughout Time and Space

Author: International Astronomical Union. Symposium

Publisher: Cambridge University Press

ISBN:

Category: Science

Page: 606

View: 745

IAU S266 consolidates the expertise of leading researchers to examine how star clusters can be used as key diagnostic tools within a wide range of disciplines in astrophysics. This volume provides a comprehensive presentation of the cutting-edge developments in theory, observations and simulations of star clusters and star cluster systems.

Principles of Stellar Dynamics

Author: S. Chandrasekhar

Publisher: Courier Corporation

ISBN:

Category: Science

Page: 313

View: 379

In this classic text, a Nobel Prize-winning astrophysicist presents the theory of stellar dynamics as a branch of classical dynamics--a discipline in the same general category as celestial mechanics. His method offers the advantages of clarifying the theory's fundamental issues and defining its underlying motivations. S. Chandrasekhar investigates two areas. The first concerns problems in which the time of relaxation of a stellar system is central. His method consists of analyzing the effects of stellar encounters in terms of the two-body problem of classical dynamics and applying this theory to the dynamics of star clusters. The second area investigates problems centering around Liouville's theorem and the solutions of the equation of continuity; here, the author discusses the dynamic implications of the existence of a field of differential motions, which appears to be the most striking kinematic feature of the galaxy and the extragalactic systems. This edition includes two papers by the author that were published after Principles of Stellar Dynamics and that have been studied and quoted extensively: "New Methods in Stellar Dynamics" (originally published in the Annals of the New York Academy of Sciences) and "Dynamical Friction" (originally published in The Astrophysical Journal).

Dynamical Evolution of Star Clusters - Confrontation of Theory and Observations

Author: International Astronomical Union. Symposium

Publisher: Springer

ISBN:

Category: Mathematics

Page: 436

View: 799

This volume reviews recent progress in the study of dynamics of star clusters. The meeting focused on the enormous progress of both the observation and the theoretical modeling of star clusters. New results from the refurbished Hubble Space Telescope (HST) include the mass function down to the hydrogen burning limits, white dwarf sequence, and central density profiles of `post-collapse' clusters by star counts. On the theoretical side, this symposium saw the first direct evidence of gravothermal oscillation through N-body simulation, which was made possible by GRAPE-4, the dedicated special-purpose computer for N-body simulation. Numerical techniques to combine stellar evolution and dynamical evolution of the cluster were presented. The book will be of primary interest to astrophysicists.

Dynamical Evolution of Dense Stellar Systems (IAU S246)

Author: International Astronomical Union. Symposium

Publisher: Cambridge University Press

ISBN:

Category: Science

Page: 490

View: 112

A complete review of the interdisciplinary field of dense stellar systems with emphasis on comparing observations with simulations.

Literature 1985, Part 1

Author: S. Böhme

Publisher: Springer Science & Business Media

ISBN:

Category: Science

Page: 1152

View: 273

Astronomy and Astrophysics Abstracts aims to present a comprehensive documen tation of the literature concerning all aspects of astronomy, astrophysics, and their border fields. It is devoted to the recording, summarizing, and indexing of the relevant publications throughout the world. Astronomy and Astrophysics Abstracts is prepared by a special department of the Astronomisches Rechen-Institut under the auspices of the International Astronomical Union. Volume 39 records literature published in 1985 and received before August 15, 1985. Some older documents which we received late and which are not surveyed in earlier volumes are included too. We acknowledge with thanks contributions of our colleagues all over the world. We also express our gratitude to all organiza tions, observatories, and publishers which provide us with complimentary copies of their publications. On account of the introduction of an object index the scope of index information will be considerably enlarged beginning with this volume. In connection with the subject index an additional source to satisfy the needs of retrieval is opened up. Starting with Volume 33, all the recording, correction, and data processing work was done by means of computers. The recording was done by our technical staff members Ms. Helga Ballmann, Ms. Mona El-Choura, Ms. Monika Kohl, Ms. Sylvia Matyssek. Ms. Karin Burkhardt, Ms. Susanne Schlotelburg, and Mr. Stefan Wagner supported our task by careful proofreading. It is a pleasure to thank them all for their encouragement. Heidelberg, September 1985 The Editors Contents Introduction . . . . . . . . . . . .