Exploring the Chemical Evolution of Globular Clusters and Their Stars PDF Download
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Author:
Publisher:
ISBN: 9789155490089
Category :
Languages : en
Pages : 86
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Book Description
Author:
Publisher:
ISBN: 9789155490089
Category :
Languages : en
Pages : 86
Get Book Here
Book Description
Author: E. J. Alfaro
Publisher: Cambridge University Press
ISBN: 9780521174916
Category : Science
Languages : en
Pages : 0
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Book Description
Is the current state of our galaxy primarily the result of its initial conditions or is it the product of a lifetime of complex interactions with its environment? This volume presents papers dedicated to exploring this fundamental question and examines all the key physical processes involved in the formation and evolution of the Milky Way. A dozen invited review articles by international experts summarize our understanding to date while more than fifty topical research papers present the latest results. Together, these papers provide a state-of-the-art view of topical issues such as disk instabilities, large-scale star formation, large-scale structure formation in our galaxy, chemical evolution, disk-halo feedback, the galactic globular cluster system, stellar populations, and the formation of galaxies. Also included are three panel sessions identifying key routes for critical future research. For graduate students and researchers, this volume provides a valuable and timely review of our new vision of the formation and evolution of our galaxy.
Author: C. Martinez Roger
Publisher: Cambridge University Press
ISBN: 9780521770583
Category : Science
Languages : en
Pages : 380
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Book Description
An accessible introduction to globular clusters for graduate students, and a comprehensive and up-to-date reference for researchers.
Author: Bernard E. J. Pagel
Publisher: Cambridge University Press
ISBN: 9780521559584
Category : Science
Languages : en
Pages : 394
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Book Description
A lucid, wide-ranging graduate textbook on the topical subject of galactic chemical evolution - by a pioneer of the field.
Author: Charli M Sakari
Publisher: Morgan & Claypool Publishers
ISBN: 1643277502
Category : Science
Languages : en
Pages : 128
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Book Description
This book presents a brief compilation of results from nearly a century of research on the globular star clusters in the Andromeda Galaxy (M31). It explores the techniques and limitations of the observations, the successes and challenges of the models, and the paradigm for the formation of M31 that has gradually emerged. These results will eventually be superseded by new data, better analysis techniques, and more complex models. However, the emphasis of this book is on the techniques, thought processes, and connections with other studies.
Author: Takakubo, K.
Publisher:
ISBN:
Category : Cosmochemistry
Languages : en
Pages : 278
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Book Description
Author: Lamya A. Saleh
Publisher:
ISBN:
Category : Galaxies
Languages : en
Pages : 250
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Book Description
Author: International Astronomical Union. Symposium
Publisher: Springer Science & Business Media
ISBN: 9781402004483
Category : Science
Languages : en
Pages : 266
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Book Description
The IAU Symposium papers collected in this volume address virtually all aspects of the problem of nucleosynthesis, galactic chemical evolution, and cosmic chemical evolution. Discussions on theoretical models as well as observational studies are included. Theoretical models of nucleosynthesis in the Big Bang, in the first stellar generations, and in stars and supernovae over the histories of our Galaxy and other galaxies provide a measure of element production over the lifetime of the Universe. Observational studies of abundances in stars, galaxies, gas concentrations in galaxies and clusters of galaxies, the intergalactic medium, and gas clouds at high redshift are reviewed.
Author: Luke Jeremy Shingles
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Elements heavier than iron are almost entirely produced in stars through neutron captures and radioactive decays. Of these heavy elements, roughly half are produced by the slow neutron-capture process (s-process), which takes place under extended exposure to low neutron densities. Most of the s-process production occurs in stars with initial masses between roughly 0.8 and 8 M, which evolve through the Asymptotic Giant Branch (AGB) phase. This thesis explores several topics related to AGB stars and the s-process, with a focus on comparing theoretical models to observations in the literature on planetary nebulae, post- AGB stars, and globular cluster stars. A recurring theme is the uncertainty of 13C-pocket formation, which is crucial for building accurate models of s-process nucleosynthesis. We first investigated whether neutron-capture reactions in AGB stars are the cause of the low sulphur abundances in planetary nebulae and post-AGB stars relative to the interstellar medium. Accounting for uncertainties in the size of the partial mixing zone that forms 13C pockets and the rates of neutron-capture and neutron-producing reactions, our models failed to reproduce the observed levels of sulphur destruction. From this, we concluded that AGB nucleosynthesis is not the cause of the sulphur anomaly. We also discovered a new method to constrain the extent of the partial mixing zone using neon abundances in planetary nebulae. We next aimed to discover the stellar sites of the s-process enrichment in globular clusters that have inter- and intra-cluster variation, with the examples of M4 (relative to M5) and M22, respectively. Using a new chemical evolution code developed by the candidate, we tested models with stellar yields from rotating massive stars and AGB stars. We compared our model predictions for the production of s-process elements with abundances from s-poor and s-rich populations. We found that rotating massive stars alone do not explain the pattern of abundance variations in either cluster, and that a contribution from AGB stars with 13C pockets is required. We derived a minimum enrichment timescale from our best-fitting chemical evolution models and, although the value depends on the assumptions made about the formation of 13C pockets, our estimate of 240-360 Myr for M22 is consistent with the upper limit of 300 Myr inferred by isochrone fitting. Lastly, there is accumulating evidence that some stars (e.g., in ! Centauri) have been born with helium mass fractions as high as 40%. This motivated us to explore the impact of helium-rich abundances on the evolution and nucleosynthesis of intermediate-mass (3-6 M) AGB models. We found that the stellar yields of s-process elements are substantially lower in He-rich models, largely as a result of less intershell material being mixed into the envelope. We also found evidence that high He abundances could restrict the s-process production by 13C pockets to stars with lower initial masses.
Author: Gerard Gilmore
Publisher: Springer
ISBN: 9789400756113
Category : Science
Languages : en
Pages : 0
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Book Description
This is volume 5 of Planets, Stars and Stellar Systems, a six-volume compendium of modern astronomical research, covering subjects of key interest to the main fields of contemporary astronomy. This volume on “Galactic Structure and Stellar Populations”, edited by Gerard F. Gilmore, presents accessible review chapters on Stellar Populations, Chemical Abundances as Population Tracers, Metal-Poor Stars and the Chemical Enrichment of the Universe, The Stellar and Sub-Stellar Initial Mass Function of Simple and Composite Populations, The Galactic Nucleus, The Galactic Bulge, Open Clusters and Their Role in the Galaxy, Star Counts and the Nature of Galactic Thick Disk, The Infrared Galaxy, Interstellar PAHs and Dust, Galactic Neutral Hydrogen, High-Velocity Clouds, Magnetic Fields in Galaxies, Astrophysics of Galactic Charged Cosmic Rays, Gamma-Ray Emission of Supernova Remnants and the Origin of Galactic Cosmic Rays, Galactic Distance Scales, Globular Cluster Dynamical Evolution, Dynamics of Disks and Warps, Mass Distribution and Rotation Curve in the Galaxy, Dark Matter in the Galactic Dwarf Spheroidal Satellites, and History of Dark Matter in Galaxies. All chapters of the handbook were written by practicing professionals. They include sufficient background material and references to the current literature to allow readers to learn enough about a specialty within astronomy, astrophysics and cosmology to get started on their own practical research projects. In the spirit of the series Stars and Stellar Systems published by Chicago University Press in the 1960s and 1970s, each chapter of Planets, Stars and Stellar Systems can stand on its own as a fundamental review of its respective sub-discipline, and each volume can be used as a textbook or recommended reference work for advanced undergraduate or postgraduate courses. Advanced students and professional astronomers in their roles as both lecturers and researchers will welcome Planets, Stars and Stellar Systems as a comprehensive and pedagogical reference work on astronomy, astrophysics and cosmology.
