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Intermediate To High Mass Pre Main Sequence Stars And Their Disks
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Book Synopsis Intermediate to High-mass Pre-main-sequence Stars and Their Disks by : Johanna Poorta
Download or read book Intermediate to High-mass Pre-main-sequence Stars and Their Disks written by Johanna Poorta and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis came about against the backdrop of the query of massive star formation, with a special focus on young intermediate- to high-mass stars in their natal environment: massive star forming regions (mSFRs). The outcome of the (massive) star-formation process is studied by characterizing young (high-mass) stars that reveal their photosphere as well as signs remnant of formation in optical to near-infrared spectra. A sample of these relatively massive pre-main-sequence (PMS) stars in the giant H II region M17 is extensively studied in multiple wavelength regimes with the aim to characterize their circumstellar disks. The observational and theoretical results presented touch upon a broad range of topics ranging from the formation of high-mass close binaries to disk formation and evolution in the harsh and dense environments of giant H II regions. Following the introduction in Chapter 1, Chapter 2 presents a census of the young stellar content of the three giant H II regions M8, G333.6−0.2, and NGC6357, including the classification of H- and K-band spectra of about 200 stars in these regions. Chapter 3 presents an analysis of the CO ro-vibrational first and second overtone bandhead emission from the circumstellar disks of five intermediate- to high-mass PMS stars in the mSFR M17. Chapter 4 is a further study of four of those objects, using high resolution ALMA (sub-)mm continuum and CO rotational line observations, that provide constraints on disk size, and total gas and dust mass. Chapter 5 presents a theoretical exploration of the CO fundamental ro-vibrational transitions as a probe of the intermediate disk regions (1-10 au) between the innermost and extended disk areas investigated in the previous two chapters."--
Book Synopsis Formation and Evolution of Low Mass Stars by : A.K. Dupree
Download or read book Formation and Evolution of Low Mass Stars written by A.K. Dupree and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the Proceedings of the NATO Advanced Study Insti tute on Formation and Evolution of Low Mass Stars held from 21 September to 2 October 1987 at Viana do Castelo, Portugal. Holding the meeting in Portugal recognized both the historical aspects and the bright future of astronomy in Portugal. In the early sixteenth century, the Portugese played an important role in the critical diffusion of classical and medieval knowledge which formed so large a part of scientific activity at that time. Navigation and course setting, brought to a high level by Portugese explorers, relied on mathematics and astronomy to produce precise tables of solar positions. In contemporary Portu gal, astronomy is the focus of renewed interest and support at the universities. It is thus particularly appropriate that the NATO Advanced Study Institute was held on the coast of the Atlantic Ocean in the friendly surroundings of the Costa Verde.
Book Synopsis A Test of Star Formation Theory by : Keivan Guadalupe Stassen
Download or read book A Test of Star Formation Theory written by Keivan Guadalupe Stassen and published by . This book was released on 2000 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Worlds, New Horizons in Astronomy and Astrophysics by : National Research Council
Download or read book New Worlds, New Horizons in Astronomy and Astrophysics written by National Research Council and published by National Academies Press. This book was released on 2011-02-04 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven by discoveries, and enabled by leaps in technology and imagination, our understanding of the universe has changed dramatically during the course of the last few decades. The fields of astronomy and astrophysics are making new connections to physics, chemistry, biology, and computer science. Based on a broad and comprehensive survey of scientific opportunities, infrastructure, and organization in a national and international context, New Worlds, New Horizons in Astronomy and Astrophysics outlines a plan for ground- and space- based astronomy and astrophysics for the decade of the 2010's. Realizing these scientific opportunities is contingent upon maintaining and strengthening the foundations of the research enterprise including technological development, theory, computation and data handling, laboratory experiments, and human resources. New Worlds, New Horizons in Astronomy and Astrophysics proposes enhancing innovative but moderate-cost programs in space and on the ground that will enable the community to respond rapidly and flexibly to new scientific discoveries. The book recommends beginning construction on survey telescopes in space and on the ground to investigate the nature of dark energy, as well as the next generation of large ground-based giant optical telescopes and a new class of space-based gravitational observatory to observe the merging of distant black holes and precisely test theories of gravity. New Worlds, New Horizons in Astronomy and Astrophysics recommends a balanced and executable program that will support research surrounding the most profound questions about the cosmos. The discoveries ahead will facilitate the search for habitable planets, shed light on dark energy and dark matter, and aid our understanding of the history of the universe and how the earliest stars and galaxies formed. The book is a useful resource for agencies supporting the field of astronomy and astrophysics, the Congressional committees with jurisdiction over those agencies, the scientific community, and the public.
Book Synopsis The Physics of Star Formation and Early Stellar Evolution by : Charles J. Lada
Download or read book The Physics of Star Formation and Early Stellar Evolution written by Charles J. Lada and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of stars is one of the principle mysteries of nature. During the last two decades advances in technology have enabled more progress to be made in the quest to understand stellar origins than at any other time in history. The study of star formation has developed into one of the most important branches of mod ern astrophysical research. A large body of observational data and a considerable literat ure now exist concerning this topic and a 1arge community of international astronomers and physicists devote their efforts attempting to decipher the secrets of stellar birth. Yet, the young astronomerjphysicist or more advanced researcher desiring to obtain a basic background in this area of research must sift through a very diverse and sometimes bewildering literature. A literature which includes research in many discip1ines and sub discip1ines of classical astrophysics from stel lar structure to the interstellar medium and encompasses the entire range of the electromagnetic spectrum from radio to gamma rays. Often, the reward of a suc cessfu1 foray through the current literature is the realization that the results can be obsolete and outdated as soon as the ink is dry in the journal or the conference proceeding in which they are published.
Book Synopsis The Formation of Stars by : Steven W. Stahler
Download or read book The Formation of Stars written by Steven W. Stahler and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive treatment of star formation, one of the most active fields of modern astronomy. The reader is guided through the subject in a logically compelling manner. Starting from a general description of stars and interstellar clouds, the authors delineate the earliest phases of stellar evolution. They discuss formation activity not only in the Milky Way, but also in other galaxies, both now and in the remote past. Theory and observation are thoroughly integrated, with the aid of numerous figures and images. In summary, this volume is an invaluable resource, both as a text for physics and astronomy graduate students, and as a reference for professional scientists.
Book Synopsis Stellar Rotation by : Arnold Hanslmeier
Download or read book Stellar Rotation written by Arnold Hanslmeier and published by Springer Nature. This book was released on with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Astronomical Journal written by and published by . This book was released on 2007 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Massive Stars Before and on the Main Sequence by : Frank Backs
Download or read book Massive Stars Before and on the Main Sequence written by Frank Backs and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Stars more than eight times as massive as the Sun are considered massive. These stars end their lives in violent explosions called supernovae. In these explosions they significantly perturb their surroundings. Additionally, during their lives they also ionize the surrounding interstellar medium through their strong radiation fields.This same radiation also causes the stars to blow away their own surface layers in a stellar outflow or wind. Stars can lose a significant fraction of their initial mass as a result of these winds, affecting their evolution. Through this wind and the supernova at the end of their life, massive stars enrich galaxies with heavy chemical elements formed in the nuclear fusion. To fully understand the impact of massive stars their formation, initial properties, and life need to be properly understood. Therefore, we study the circumstellar disks of two Galactic pre-main-sequence stars. We find their masses to be significantly smaller than the mass of the central stars. Additionally, the disks show signs of perturbation and are consistent with reaching down to the stellar surface. We perform a monte carlo analysis of the binary properties of a set of stellar clusters and find a trend in binary period with stellar age. Further analysis of the youngest cluster, M17, reveals the outcome of massive star formation and empirically confirms the location of the ZAMS for stars above 10 solar masses. Finally, a study of clumped stellar winds at different metallicities shows a trend in both luminosity and metallcity in the wind luminosity relation."--
Book Synopsis The Origin of Stars by : Michael David Smith
Download or read book The Origin of Stars written by Michael David Smith and published by Imperial College Press. This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whre do stars come from and how do they form? These are profound questions which link the nature of our Universe to the roots of mankind. Yet, until a recent revolution in understanding, the proposed answers have been raw speculation. Now, accompanying penetrating observations, a new picture has come into prominence. This book presents the latest astounding observations and scientific ideas covering star formation, star birth and early development. It encompasses all aspects, from the dramatic stories of individual objects, to the collective influence of entire stellar systems. The very first stars to come into existence and the nurturing of planets are discussed to provide the reader with a comprehensive overview. Presenting background information with only the essential mathematics, this book will appeal to scientists wishing to expand their horizons, students seeking solid foundations, and general readers with enquiring minds.
Book Synopsis An Introduction to Star Formation by : Derek Ward-Thompson
Download or read book An Introduction to Star Formation written by Derek Ward-Thompson and published by Cambridge University Press. This book was released on 2011-02-10 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guiding the reader through all the stages that lead to the formation of a star such as our Sun, this advanced textbook provides students with a complete overview of star formation. It examines the underlying physical processes that govern the evolution from a molecular cloud core to a main-sequence star, and focuses on the formation of solar-mass stars. Each chapter combines theory and observation, helping readers to connect with and understand the theory behind star formation. Beginning with an explanation of the interstellar medium and molecular clouds as sites of star formation, subsequent chapters address the building of typical stars and the formation of high-mass stars, concluding with a discussion of the by-products and consequences of star formation. This is a unique, self-contained text with sufficient background information for self-study, and is ideal for students and professional researchers alike.
Book Synopsis Protostars and Planets VI by : Henrik Beuther
Download or read book Protostars and Planets VI written by Henrik Beuther and published by University of Arizona Press. This book was released on 2014-12-18 with total page 945 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a conference held in Heidelberg, Germany, July 15-20, 2013.
Book Synopsis Structure and Emission Properties of Accretion Disks by : C. BERTOUT (Ed)
Download or read book Structure and Emission Properties of Accretion Disks written by C. BERTOUT (Ed) and published by Atlantica Séguier Frontières. This book was released on 1991 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Science with the Atacama Large Millimeter Array: by : Rafael Bachiller
Download or read book Science with the Atacama Large Millimeter Array: written by Rafael Bachiller and published by Springer Science & Business Media. This book was released on 2008-04-03 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently under construction in Northern Chile, the Atacama Large Millimeter Array (ALMA) is the most ambitious astronomy facility under construction. This book describes the enormous capabilities of ALMA, the state of the project, and most notably the scientific prospects of such a unique facility. The book includes reviews and recent results on most hot topics of modern astronomy. It looks forward to the revolutionary results that are likely to be obtained with ALMA.
Book Synopsis Classifying the Cosmos by : Steven J. Dick
Download or read book Classifying the Cosmos written by Steven J. Dick and published by Springer. This book was released on 2019-03-21 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the invention of the telescope 400 years ago, astronomers have rapidly discovered countless celestial objects. But how does one make sense of it all? Astronomer and former NASA Chief Historian Steven J. Dick brings order to this menagerie by defining 82 classes of astronomical objects, which he places in a beginner-friendly system known as "Astronomy’s Three Kingdoms.” Rather than concentrating on technicalities, this system focuses on the history of each object, the nature of its discovery, and our current knowledge about it. The ensuing book can therefore be read on at least two levels. On one level, it is an illustrated guide to various types of astronomical wonders. On another level, it is considerably more: the first comprehensive classification system to cover all celestial objects in a consistent manner. Accompanying each spread are spectacular historical and modern images. The result is a pedagogical tour-de-force, whereby readers can easily master astronomy’s three realms of planets, stars, and galaxies.
Book Synopsis Angular Momentum Evolution of Young Stars by : S Catalano
Download or read book Angular Momentum Evolution of Young Stars written by S Catalano and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports the Proceedings of the NATO Advanced Research Workshop on "An gular Momentum Evolution of Young Stars" held from 17 to 21 September 1990 at Noto, Italy. The workshop had its immediate origin in a discussion about the availability of stel lar rotation data, that took place in 1987 at Viana do Castelo Portugal during the NATO meeting, Formation and Evolution of Low Mass Stars. We recognized that nearly 20 years had passed since the last meeting on stellar rotation and that significant progress in the observation of rotation rates in low mass stars had been made. During the last 20 years, new efficient instrumentation (CCD and photon counting de tectors and echelle spectrographs) and new analysis techniques (profile Fourier analysis) have allowed us to measure rotational velocities as low as 1-2 km/s and to reach low mass stars in young clusters. Even with these advances, rotational velocities of low mass stars would have remained challenging to determine if all single, low mass stars later than GO had rotational velocities of order or less than 10 km/sec. Evidence that this is not always the case was first provided by the photometric variability data obtained by van Leeuwen and Alphenaar for K dwarfs in the Pleiades and more recently by the vsini measurements of low mass stars in several young clusters.
Book Synopsis Variables Stars and the Astrophysical Returns of the Microlensing Surveys by : Roger Ferlet
Download or read book Variables Stars and the Astrophysical Returns of the Microlensing Surveys written by Roger Ferlet and published by Atlantica Séguier Frontières. This book was released on 1997 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
