Download or read book Evolution of Helium Star white Dwarf Binaries Leading Up to Thermonuclear Supernovae written by Tin Long Sunny Wong and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Thermonuclear supernovae are believed to be explosions of carbon-oxygen white dwarfs (CO WDs), but how these CO WDs reach explosion conditions remains debated. In this project we study the helium donor channel which involves a CO WD growing in mass through accretion from a nondegenerate helium star and exploding when it approaches the critical Chandrasekhar mass."--Page [iii]
Download or read book Thermonuclear Supernovae written by P. Ruiz-Lapuente and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 891 pages. Available in PDF, EPUB and Kindle. Book excerpt: All theoretical and observational topics relevant to the understanding of the thermonuclear (Type Ia) supernova phenomenon are thoroughly and consistently reviewed by a panel including the foremost experts in the field. The book covers all aspects, ranging from the observations of SNe Ia at all stages and all wavelengths to the 2D and 3D modelling of thermonuclear flames in very dense plasmas. Scenarios for close binary evolution leading to SNe Ia are discussed. Particular emphasis is placed on the homogeneity vs. diversity of SNe Ia and on their use as standard candles to measure cosmological parameters. The book reflects the recent and very significant progress made in both the modelling of the explosions and in the observational field.
Download or read book Stellar Science written by Steff Jaywan and published by Dedona Publishing. This book was released on with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of two titles, which are the following: Stellar Evolution - Stellar evolution refers to the process by which a star changes over the course of time. This field of astrophysics studies the formation, life, and death of stars, which involves a series of complex physical processes and transformations. Here, we outline the key stages and concepts in stellar evolution. Supernovae - Supernovae are incredibly powerful explosions that occur at the end of a star's life cycle, during which the star undergoes a dramatic increase in brightness, often outshining an entire galaxy for a brief period. They can occur through various mechanisms, such as the collapse of massive stars or the thermonuclear explosions of white dwarfs in binary systems. Supernovae play a crucial role in the evolution of galaxies, as they distribute heavy elements and trigger the formation of new stars and planetary systems.
Download or read book Supernovae written by Steff Jaywan and published by Dedona Publishing. This book was released on with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supernovae are incredibly powerful explosions that occur at the end of a star's life cycle, during which the star undergoes a dramatic increase in brightness, often outshining an entire galaxy for a brief period. They can occur through various mechanisms, such as the collapse of massive stars or the thermonuclear explosions of white dwarfs in binary systems. Supernovae play a crucial role in the evolution of galaxies, as they distribute heavy elements and trigger the formation of new stars and planetary systems. Supernovae are pivotal events in astrophysics, influencing our understanding of the universe in multifaceted ways. Firstly, they are factories for heavy elements such as iron and gold, synthesizing and dispersing these crucial building blocks of planets and life itself into the interstellar medium. This process, known as nucleosynthesis, is integral to cosmic chemical enrichment, shaping the composition of subsequent generations of stars and galaxies. Beyond their role in elemental production, supernovae release immense amounts of energy, profoundly impacting their surroundings. This energy input drives processes like star formation and galactic winds, influencing the overall dynamics and evolution of galaxies. Moreover, supernovae, particularly Type Ia, serve as standard candles for measuring cosmic distances, pivotal in our understanding of the universe's expansion and the discovery of dark energy.
Download or read book White Dwarf Models of Supernovae and Cataclysmic Variables written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: If the accreting white dwarf increases its mass to the Chandrasekhar mass, it will either explode as a Type I supernova or collapse to form a neutron star. In fact, there is a good agreement between the exploding white dwarf model for Type I supernovae and observations. We describe various types of evolution of accreting white dwarfs as a function of binary parameters (i.e, . composition, mass, and age of the white dwarf, its companion star, and mass accretion rate), and discuss the conditions for the precursors of exploding or collapsing white dwarfs, and their relevance to cataclysmic variables. Particular attention is given to helium star cataclysmics which might be the precursors of some Type I supernovae or ultrashort period x-ray binaries. Finally we present new evolutionary calculations using the updated nuclear reaction rates for the formation of O+Ne+Mg white dwarfs, and discuss the composition structure and their relevance to the model for neon novae. 61 refs., 14 figs.
Download or read book Astrophysics in a Nutshell written by Dan Maoz and published by Princeton University Press. This book was released on 2016-02-23 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ideal one-semester astrophysics introduction for science undergraduates—now expanded and fully updated Winner of the American Astronomical Society's Chambliss Award, Astrophysics in a Nutshell has become the text of choice in astrophysics courses for science majors at top universities in North America and beyond. In this expanded and fully updated second edition, the book gets even better, with a new chapter on extrasolar planets; a greatly expanded chapter on the interstellar medium; fully updated facts and figures on all subjects, from the observed properties of white dwarfs to the latest results from precision cosmology; and additional instructive problem sets. Throughout, the text features the same focused, concise style and emphasis on physics intuition that have made the book a favorite of students and teachers. Written by Dan Maoz, a leading active researcher, and designed for advanced undergraduate science majors, Astrophysics in a Nutshell is a brief but thorough introduction to the observational data and theoretical concepts underlying modern astronomy. Generously illustrated, it covers the essentials of modern astrophysics, emphasizing the common physical principles that govern astronomical phenomena, and the interplay between theory and observation, while also introducing subjects at the forefront of modern research, including black holes, dark matter, dark energy, and gravitational lensing. In addition to serving as a course textbook, Astrophysics in a Nutshell is an ideal review for a qualifying exam and a handy reference for teachers and researchers. The most concise and current astrophysics textbook for science majors—now expanded and fully updated with the latest research results Contains a broad and well-balanced selection of traditional and current topics Uses simple, short, and clear derivations of physical results Trains students in the essential skills of order-of-magnitude analysis Features a new chapter on extrasolar planets, including discovery techniques Includes new and expanded sections and problems on the physics of shocks, supernova remnants, cosmic-ray acceleration, white dwarf properties, baryon acoustic oscillations, and more Contains instructive problem sets at the end of each chapter Solutions manual (available only to professors)
Download or read book Stellar Astrophysics written by Roger John Tayler and published by Taylor & Francis Group. This book was released on 1992 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stellar Astrophysics contains a selection of high-quality papers that illustrate the progress made in research into the structure and evolution of stars. Senior undergraduates, graduates, and researchers can now be brought thoroughly up to date in this exciting and ever-developing branch of astronomy.
Download or read book Interacting Giants and Compact Stars written by Alexey Bobrick and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is based on four papers dealing with various aspects of interactions in binary stars. Interactions between stars occur at nearly all stages of their evolution and can take many forms. For example, stars may lose material to a binary companion, merge, interact with groups of other stars in star clusters and explode in binary systems, among other interactions. The first paper in this thesis, Bobrick et al. (2017) (Paper I), models how white dwarfs interact with neutron stars as they spiral into contact due to gravitational wave emission. Through the use of hydrodynamic simulations with the Oil-on-Water code, we investigated the process of mass transfer in such binaries. We found that early phases of interactions in these systems lead to significant loss of angular momentum, driving systems to merge more often than previously expected. The third paper in the thesis, Bobrick et al. (2021a) (Paper III), describes the subsequent evolution of the white dwarf-neutron star binaries containing a massive white dwarf after they merge. In this case, the white dwarf gets shredded into a disc, reaching high temperatures leading to nuclear reactions. These nuclear reactions in the disc produce nickel-56 that gets ejected with the rest of the material from the vicinity of the neutron star. As the ejected material expands, the radioactive nickel-56 heats the material, causing it to glow and become observable as a supernova-like transient event. We used hydrodynamic simulations based on the Water code and a nuclear processing code Torch to study nucleosynthesis in the disc, and a supernova spectral synthesis code SuperNu to model how these events may be observed. Unlike papers I and III, which dealt with compact objects, papers II and IV focussed on interactions involving giant stars. In the second paper, Vos et al. (2020) (Paper II), we modelled how mass transfer between red giants and main-sequence stars can give rise to subdwarf B stars. These subdwarf B stars are remnant cores of the red giants that ignited helium while losing mass. By performing a population study based on detailed stellar structure code MESA, we found that the orbits of such subdwarf B binaries bear imprints of the chemical history of our Galaxy. The fact that the Milky Way had changed its metal content over time allowed us to explain the orbital periods of the known subdwarf B binaries. In our fourth study, Bobrick et al. (2021b) (Paper IV), we investigated the formation history of Betelgeuse, which is a red supergiant visible to the naked eye. It has been recently realised that Betelgeuse is likely an outcome of a merger between two stars that were ejected from their birth environment. To test this scenario, we used the FewBody code together with a Monte Carlo-based model of dynamical interactions in the Milky Way star clusters and synthesised a population of stars which may lead to the formation of Betelgeuse. We have confirmed that a stellar merger is indeed a likely mechanism behind the formation of Betelgeuse.
Download or read book The Impact of Binary Stars on Stellar Evolution written by Giacomo Beccari and published by Cambridge University Press. This book was released on 2019-04-18 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced review of how binary stars affect stellar evolution, presenting results from state-of-the art models and recent observations.
Download or read book Supernovae written by Albert G. Petschek and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: For millennia mankind has watched as the heavens move in their stately progression from night to night and from year to year, presaging with their changes the changing seasons. The sun, the moon, and the planets move in what appears to be an unchanging firmament, except occasionally when a new "star" appears. Among the new stars there are comets, novae, and finally supernovae, the subject of this book. Superstitious mankind regarded these events as significant portents and recorded them carefully so that we have records of supernovae that may reach back as far as 1300 B. C. (Clark and Stephenson, 1977; Murdin and Murdin, 1985). The Cygnus Loop, believed to be a 15,000-year-old supernova remnant at a distance of only 800 pc (Chevalier and Seward, 1988), must have awed our ancestors. Tycho's supernova of 1572, at a distance of 2500 pc, had a magnitude of -4. 0, comparable to Venus at its brightest, and Kepler's supernova of 1604 had a magnitude of - 3 or so. Thus the Cygnus Loop supernova might have had a magnitude of - 6 or so, and should have been readily visible in daytime. A supernova in Vela, about 8000 B. C. was comparably close, as was SN 1006, whose magnitude may have been -9. While most of the supernova records come from the Old World, the supernova of 1054 is recorded in at least one petroglyph in the American West.
Download or read book Stars and Stellar Processes written by Mike Guidry and published by Cambridge University Press. This book was released on 2019-02-07 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the physics of stars in relation to modern topics such as neutrino oscillations, supernovae, black holes, and gravitational waves.
Download or read book Handbook of Supernovae written by Athem W. Alsabti and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supernova Explosions written by David Branch and published by Springer. This book was released on 2017-08-02 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: Targeting advanced students of astronomy and physics, as well as astronomers and physicists contemplating research on supernovae or related fields, David Branch and J. Craig Wheeler offer a modern account of the nature, causes and consequences of supernovae, as well as of issues that remain to be resolved. Owing especially to (1) the appearance of supernova 1987A in the nearby Large Magellanic Cloud, (2) the spectacularly successful use of supernovae as distance indicators for cosmology, (3) the association of some supernovae with the enigmatic cosmic gamma-ray bursts, and (4) the discovery of a class of superluminous supernovae, the pace of supernova research has been increasing sharply. This monograph serves as a broad survey of modern supernova research and a guide to the current literature. The book’s emphasis is on the explosive phases of supernovae. Part 1 is devoted to a survey of the kinds of observations that inform us about supernovae, some basic interpretations of such data, and an overview of the evolution of stars that brings them to an explosive endpoint. Part 2 goes into more detail on core-collapse and superluminous events: which kinds of stars produce them, and how do they do it? Part 3 is concerned with the stellar progenitors and explosion mechanisms of thermonuclear (Type Ia) supernovae. Part 4 is about consequences of supernovae and some applications to astrophysics and cosmology. References are provided in sufficient number to help the reader enter the literature.
Download or read book Physics of Relativistic Objects in Compact Binaries from Birth to Coalescence written by Monica Colpi and published by Springer Science & Business Media. This book was released on 2009-03-28 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: A very attractive feature of the theory of general relativity is that it is a perfectexampleofa“falsi?able”theory:notunableparameterispresentinthe theory and therefore even a single experiment incompatible with a prediction of the theory would immediately lead to its inevitable rejection, at least in the physical regime of application of the aforementioned experiment. This fact provides additional scienti?c value to one of the boldest and most fascinating achievements of the human intellect ever, and motivates a wealth of e?orts in designing and implementing tests aimed at the falsi?cation of the theory. The ?rst historical test on the theory has been the de?ection of light gr- ing the solar surface (Eddington 1919): the compatibility of the theory with this ?rst experiment together with its ability to explain the magnitude of the perihelion advance of Mercury contributed strongly to boost acceptance and worldwideknowledge.However,technologicallimitations preventedphysicists from setting up more constraining tests for several decades after the formu- tion of the theory. In fact, a relevant problem with experimental general r- ativity is that the predicted deviations from the Newtonian theory of gravity areverysmallwhentheexperimentsarecarriedoutinterrestriallaboratories.
Download or read book Supernovae and Nucleosynthesis written by David Arnett and published by Princeton University Press. This book was released on 2020-11-10 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book investigates the question of how matter has evolved since its origin in the Big Bang, from the cosmological synthesis of hydrogen and helium to the generation of the complex set of nuclei that comprise our world and our selves. A central theme is the evolution of gravitationally contained thermonuclear reactors, otherwise known as stars. Our current understanding is presented systematically and quantitatively, by combining simple analytic models with new state-of-the-art computer simulations. The narrative begins with the clues (primarily the solar system abundance pattern), the constraining physics (primarily nuclear and particle physics), and the thermonuclear burning in the Big Bang itself. It continues with a step-by-step description of how stars evolve by nuclear reactions, a critical investigation of supernova explosion mechanisms and the formation of neutron stars and of black holes, and an analysis of how such explosions appear to astronomers (illustrated by comparison with recent observations). It concludes with a synthesis of these ideas for galactic evolution, with implications for nucleosynthesis in the first generation of stars and for the solar system abundance pattern. Emphasis is given to questions that remain open, and to active research areas that bridge the disciplines of astronomy, cosmochemistry, physics, and planetary and space science. Extensive references are given.
Download or read book Thermonuclear Supernova in Binary Helium Dwarfs written by Thaddeus Mazurek and published by . This book was released on 1973 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stellar Structure and Evolution written by Rudolf Kippenhahn and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete and comprehensive treatment of the physics of the stellar interior and the underlying fundamental processes and parameters. The text presents an overview of the models developed to explain the stability, dynamics and evolution of the stars, and great care is taken to detail the various stages in a star's life. The authors have succeeded in producing a unique text based on their own pioneering work in stellar modeling. Since its publication, this textbook has come to be considered a classic by both readers and teachers in astrophysics. This study edition is intended for students in astronomy and physics alike.
