Laboratory Astrophysics (IAU S350)
Laboratory Astrophysics (IAU S350)

Author: Farid Salama

Publisher: Cambridge University Press

Published: 2020-09-30

Total Pages: 400

ISBN-13: 9781108482479

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Laboratory astrophysics is the Rosetta Stone that enables astronomers to understand and interpret the distant cosmos. It provides the tools to interpret and guide astronomical observations and delivers the numbers needed to quantitatively model the processes taking place in space, providing a bridge between observers and modelers. IAU Symposium 350 was organized by the International Astronomical Union's Laboratory Astrophysics Commission (B5), and was the first topical symposium on laboratory astrophysics sponsored by the IAU. Active researchers in observational astronomy, space missions, experimental and theoretical laboratory astrophysics, and astrochemistry discuss the topics and challenges facing astronomy today. Five major topics are covered, spanning from star- and planet-formation through stellar populations to extragalactic chemistry and dark matter. Within each topic, the main themes of laboratory studies, astronomical observations, and theoretical modeling are explored, demonstrating the breadth and the plurality of disciplines engaged in the growing field of laboratory astrophysics.

Magnetic Fields in O, B, and a Stars
Magnetic Fields in O, B, and a Stars

Author: Swetlana Hubrig

Publisher: Programme: Aas-Iop Astronomy

Published: 2021-06-28

Total Pages: 140

ISBN-13: 9780750323901

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The last few decades have seen significant progress in our understanding of the occurrence of magnetic fields in stars with radiative envelopes, in particular in massive stars and in intermediate mass stars at early evolutionary stages. This book provides a comprehensive review of the most recent achievements in the measurements of stellar magnetic fields in O, B and A stars. These include the archetypes of stellar magnetism, the chemically peculiar Ap and Bp stars, O- and early B-type stars with their magnetospheres, accreting Herbig Ae/Be stars, Wolf-Rayet stars and high-mass X-ray binaries, among others. It provides an overview of the underlying physics for the interpretation of the data and identifies the requirements, both observational and theoretical, for improving our understanding of the origin of the magnetic fields in early-type stars. It aims to educate scientists working on stars, who are not yet experts in magnetic field studies, assuming that the reader is already familiar with basic terms and concepts of stellar astrophysics. Key Features Provides a comprehensive review of the field for researchers and students Gives an overview of the underlying physics for the interpretation of data Identifies requirements for understanding the origin of magnetic fields in early-type stars First research-level book on the topic Written by experts in the field of stellar magnetism

Where Have All the Ap Stars Gone? Rotation, Chemical Abundances and Magnetic Fields of Ap Stars in Nearby Open Clusters
Where Have All the Ap Stars Gone? Rotation, Chemical Abundances and Magnetic Fields of Ap Stars in Nearby Open Clusters

Author: James Silvester

Publisher:

Published: 2007

Total Pages: 119

ISBN-13: 9780494302477

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To gain insight into the chemical and magnetic evolution of upper-main sequence stars, we have undertaken a study of magnetic Ap stars in nearby northern open clusters with well-determined ages. Using the MuSiCoS spectropolarimeter on the 2 m Bernard Lyot telescope at Pic du Midi observatory, high-resolution (R = 35,000), moderate to high S/N (50--700) circular polarisation spectra have been obtained for 11 Ap stars (HD 19805, HD 21699, HD 23387, HD 23408, HD 23850, HD 28319, HD 171586, HD 171782, HD 205116, HD 205117, HD 205073) proposed as members of 5 open clusters (M39, IC 4756, the Pleiades, alpha Per and the Hyades). We determined chemical abundances using spectral line synthesis, with each elemental abundance determined based on multiple spectral lines, with the typical abundance uncertainty being 0.2 dex. Longitudinal magnetic field strengtl-1s were determined using Least Squares Deconvolved Stokes V profiles; with a typical uncertainty of about 100 gauss. Finally, projected rotational velocities were determined for each star, with a typical precision of 2 km/s. During the course of this study it became apparent that many of the stars studied are not in fact magnetic chemically peculiar stars. Some stars appear to be chemically normal, others appear to be other classes of non-magnetic chemically peculiar stars. Ultimately, it was concluded that only two of the observed stars are in fact magnetic chemically peculiar stars. Is this interesting and surprising finding purely a result of misclassification in the archival data, or does this say something important about the occurrences of magnetic chemically peculiar stars in open clusters? We present the results of this study, discussing the implications and providing suggestions for future research.

Cosmic Magnetism,
Cosmic Magnetism,

Author: Percy Seymour

Publisher: CRC Press

Published: 1986

Total Pages: 168

ISBN-13:

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The study of extraterrestrial magnetic fields is a relatively new one, confirmation of the existance of the first such field (that of our Sun) having come a s late as 1908. In the past 30 years a great ammount of knowledge has been accumulated on Cosmic Magnetism, which has turned out to be a truly fascinating topic for study. Percy Seymour's book is the first to deal with the topic in a non-mathematical way, and he offers a fine introduction to his subject. The first three chapters consolidate our knowledge on magnetism in general and the magnetic field of the Earth, as well as discussing the reasons for studying astronomy and cosmic magnetism in particular. The remainder of the book is devoted to the main areas of cosmic magnetism - solar, plantetary and interplanetary fields, fields in stars and pulsars, fields of the milky way and fields in other galaxies. Cosmic Magnetism in an ideal book for sixth-formers and undergraduates studying physics or astronomy and will also appeal to amateur astronomers. as previous work on this topic has been 'hidden' in specialised academic journals.

The Strongest Magnetic Fields in the Universe
The Strongest Magnetic Fields in the Universe

Author: Vasily S. Beskin

Publisher: Springer

Published: 2016-01-29

Total Pages: 579

ISBN-13: 149393550X

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This volume extends the ISSI series on magnetic fields in the Universe into the domain of what are by far the strongest fields in the Universe, and stronger than any field that could be produced on Earth. The chapters describe the magnetic fields in non-degenerate strongly magnetized stars, in degenerate stars (such as white dwarfs and neutron stars), exotic members called magnetars, and in their environments, as well as magnetic fields in the environments of black holes. These strong fields have a profound effect on the behavior of matter, visible in particular in highly variable processes like radiation in all known wavelengths, including Gamma-Ray bursts. The generation and structure of such strong magnetic fields and effects on the environment are also described.

Structure and Evolution of Stars
Structure and Evolution of Stars

Author: Martin Schwarzschild

Publisher: Princeton University Press

Published: 2015-12-08

Total Pages: 317

ISBN-13: 1400879175

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With the development of nuclear physics the theory of the stellar interior entered a new phase. Many new investigations have been conducted and the results published in a variety of specialized media. This book brings these results together in a single volume and summarizes the present status of the theory of stellar evolution. Originally published in 1958. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.