Download or read book Star Disk Interaction in Young Stars IAU S243 written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2007 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews latest star-disk interaction region in young stars for graduate students and researchers.
Download or read book Star disk Interaction in Young Stars written by International Astronomical Union Symposium and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Star disk Interactions in Young Stars written by International Astronomical Union. Symposium and published by . This book was released on 2007 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Twenty Seventh General Assembly Rio de Janeiro 2009 written by Ian F. Corbett and published by Cambridge University Press. This book was released on 2010-06-03 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete record of the formal organisational and administrative proceedings of the XXVII General Assembly of the International Astronomical Union.
Download or read book Information Bulletin written by International Astronomical Union and published by . This book was released on 2009 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observation and Modelling of Disks about Young Stars with ALMA written by Sacha Gavino and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The star formation process usually proceeds with protoplanetary disks. These disks contain a mixture of gas, accounting for 99 % of the disk mass, and of solid particles called dust grains (1 % of the disk mass). These grains, initially at sub-micro metric sizes, gradually coagulate, grow, and potentially allow for the formation of planets about the star.The study of the dust and molecular composition of young disks is fundamental to constraint the physical and chemical initial conditions of planetary formation and the origins of the chemical composition of the planetary cores.The goal of this thesis was to build state-of-the-art models of typical young disks consisting of gas and of a population of grains of multiple sizes, then, in a new approach, to test with the use of numerical simulations the implication of the size and temperature distributions on the chemical evolution of disks.To achieve this, we have coupled the 3D Monte-Carlo radiative transfer code POLARIS to the time-dependent gas-grain code NAUTILUS. The radiative transfer code allowed us to finely compute the grain temperature as a function of the size and location as well as the UV flux within the disk. The gas-grain code was able to simulate the evolution of the chemical abundances in our disk models. Moreover, the computation of the UV flux by POLARIS coupled to a set of molecular cross-sections extracted from a comprehensive database allowed us to compute as a function of the frequency the rates of molecular photoabsorption, photodissociation, and photoionization.
Download or read book Accretion Processes in Star Formation written by Lee Hartmann and published by Cambridge University Press. This book was released on 2000-11-15 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent discoveries of extrasolar planets and new direct evidence for protoplanetary disks around young stars have had a major impact on our understanding of star and planet formation. This volume provides a thorough, up-to-date, and concise overview of the physical processes involved in the formation of stars and their surrounding disks. The book traces the story of star formation from the fragmentation of cold molecular gas clouds, through the formation of protostars and rotating dusty disks to the subsequent accretion of material onto the central star. Lee Hartmann integrates state-of-the-art theoretical models with recent observations, highlighting important problems that remain to be solved.
Download or read book The Role of Disks in the Angular Momentum Evolution of Young Low mass Stars written by Thompson S. Le Blanc and published by . This book was released on 2012 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiwavelength Observations of Young Stars and Their Circumstellar Disks written by David A. Principe and published by . This book was released on with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Observational studies of star and planet formation represent a fundamental means to understand the origins of exoplanetary systems and our own solar system. In this dissertation I present a multiwavelength approach to study a wide range of stages of the evolution of protostars and pre-main sequence (pre-MS) stars. I have investigated, via an infrared and multi-epoch X-ray study of the L1630 dark cloud, whether and how X-ray variability in young stellar objects is related to protostellar evolutionary state. Among a subsample of 52 X-ray-emitting young stars in L1630, I find that the earliest stages of young stellar evolution show the highest levels of X-ray variability, indicative of high levels of magnetic activity during star formation. I also find evidence of active magnetospheric accretion in three L1630 stars with circumstellar disks. I also present multiwavelength analyses of several phenomenologically interesting young stars at different stages of pre-MS stellar evolution. I investigate, via contemporaneous X-ray and optical/IR observations, the nearby, pre-main sequence star/disk systems T Chamaeleontis (T Cha) and TWA 30A and 30B. I analyze X-ray and optical emission signatures of accretion and magnetic activity in T Cha, and infer the X-ray absorbing properties of its circumstellar disk. Like T Cha, each component of the wide binary TWA 30A and 30B is viewed through a highly inclined circumstellar disk. Both TWA 30A and 30B display large near-IR variability, suggestive of (respectively) variable obscuration of the stellar photosphere and a possible disk-rim warp. In the case of T Cha and TWA 30A, I find a correlation of optical/near-IR and X-ray extinction consistent with that of photospheric obscuration from an intervening disk clump."--Abstract.
Download or read book Compact Star Physics written by Jürgen Schaffner-Bielich and published by Cambridge University Press. This book was released on 2020-08-27 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction to compact star physics explains key concepts from general relativity, thermodynamics and nuclear physics.
Download or read book Solar Magnetic Phenomena written by Arnold Hanslmeier and published by Springer Science & Business Media. This book was released on 2005-02-14 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of summerschools and workshops at the Kanzelh· ohe · Solar Observatory, Karn · · ten, Austria, devotedtoup-to-datetopicsinsolarphysics has been proven to be extremely successful, and thus in August/September 2003 the third combined summerschool and workshop was held there. This book contains the proceedings of the Summerschool and Wo- shop "Solar Magnetic Phenomena" held from 25 August to 5 September 2003 at the Solar Observatory Kanzelh· ohe, · which belongs to the Institute for Geophysics, Astrophysics and Meteorology of the University of Graz, Austria. The book contains the contributions from six invited lecturers. They give an overview on the following topics: observations of the pho- sphere and chromosphere, solar?are observations and theory, coronal mass ejections and the relevance of magnetic helicity, high-energy radiation from the Sun, the physics of solar prominences and highlights from the SOHO mission. The lectures contain about 25 to 30 pages each and provide a valuableintroduction to the topics mentioned above. The comprehensive lists ofreferences at theendof each contribution enablethe interested reader to go into more detail. The second part of the book contains contributed papers. These - pers were presented anddiscussed in theworkshop sessions during the afternoons. The sessions stimulated intensive discussions between the p- ticipants and lecturers
Download or read book History of the IAU written by Adriaan Blaauw and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This History has its origin in a suggestion, made in September 1990 by former IAU General Secretary Derek McNally, who felt "that a 75 year history of the Union was needed before the col lective memory of those who knew the Union before the Second World War vanished. It would then be a preparatory volume to a centennial history in 2019. " Indeed, of those who knew the Union that long ago, few are still with us. Six years ago, at Baltimore on August 2, 1988, listening and reminiscing at the Inaugural Ceremonies of the Union's 20th General Assembly, I realized that it was almost exactly half a century ago that, at the age of 24, I attended the Inaugurations at my "first" Assembly: on August 3, 1938 in Stockholm. Now, in 1994, this is almost 56 years ago, three quarters of the Union's age. Only vague recollections - no better than that -lead me back to this event, just before World War II. And so, this is not a history based on recollection, far from it. Recollection was helpful in that it allowed me, better perhaps than a younger author, to appreciate circumstances under which the letters and reports which form the basis for this History were written. The account is largely based on archival documents, collected from a wide variety of sources.
Download or read book Dynamics of Natural and Artificial Celestial Bodies written by Halina Pretka-Ziomek and published by Springer Science & Business Media. This book was released on 2001 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the US/European Celestial Mechanics Workshop, Poznan, Poland, July 3-7, 2000
Download or read book A New Theory of Jupiter and Saturn written by George William Hill and published by . This book was released on 1890 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Human Journalist written by Jim Willis and published by Praeger. This book was released on 2003-10-30 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Willis examines the many orientations and perspectives of reporters that gather and present the news of the day. Debunking the notion that there are limited perspectives journalists may use, Willis examines up to 15 different orientations that reporters bring to their work. These perspectives run the gamut, from the traditional approach of distancing oneself completely from events and people involved to becoming part of the story's fabric to ascertain the story's true essence. Willis also suggests that, for many stories, it is wholly appropriate for journalists to feel what a non-professional would experience at such an event, and to allow those emotions to fuel the reporting and writing of the story. Several examples are discussed in detail, including the coverage of the bombing of the Alfred P. Murrah Federal Building in Oklahoma City on April 19, 1995, and the terrorist attacks of September 11, 2001.
Download or read book Cosmic Magnetic Fields IAU S259 written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2009-06-11 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Symposium 259 presents the first interdisciplinary, comprehensive review of the role of cosmic magnetic fields, involving astronomers and physicists from across the community. Offering both theoretical and observational topics ranging from Earth's habitability to the origin of the universe, this is an invaluable summary for researchers and graduate students.
Download or read book Astrophysics Processes written by Hale Bradt and published by Cambridge University Press. This book was released on 2008-09-25 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridging the gap between physics and astronomy textbooks, this book provides step-by-step physical and mathematical development of fundamental astrophysical processes underlying a wide range of phenomena in stellar, galactic, and extragalactic astronomy. The book has been written for upper-level undergraduates and beginning graduate students, and its strong pedagogy ensures solid mastery of each process and application. It contains over 150 tutorial figures, numerous examples of astronomical measurements, and 201 exercises. Topics covered include the Kepler–Newton problem, stellar structure, binary evolution, radiation processes, special relativity in astronomy, radio propagation in the interstellar medium, and gravitational lensing. Applications presented include Jeans length, Eddington luminosity, the cooling of the cosmic microwave background (CMB), the Sunyaev–Zeldovich effect, Doppler boosting in jets, and determinations of the Hubble constant. This text is a stepping stone to more specialized books and primary literature. Password-protected solutions to the exercises are available to instructors at www.cambridge.org/9780521846561.
