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Author : Elena Puga
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book Early Stages of Massive Star Formation at High Spatial Resolution written by Elena Puga and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elena Puga Antolín
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (179 download)
Download or read book Early Stages of Massive Star Formation at High Spatial Resolution written by Elena Puga Antolín and published by . This book was released on 2004 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Stages of Massive Star Formation at High Spatial Resolution written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Massive star formation takes place under harsh observational conditions; as time passes, the already formed stars produce an ionised region and dissipate the surrounding molecular cloud, becoming accessible in the NIR. For this reason one of the earliest phases to observationally study massive stars is the UCHII-region phase. This thesis investigates the ionising stars and kinematics of UCHII regions at high spatial and spectral resolution. NIR-polarimetric maps of the reflection nebula that are generally found around these objects are used to rule out the presence of deeply embedded companions of a Young Stellar Object (S106) and to identify multiplicity in the main illuminating sources (also candidates to be the ionising sources) inside G77.96-0.01. This last result could also explain the relationship between some UCHIIs and their detected extended halos. An extensive analysis of a complex UCHII (G61.48+0.09) shows the problem of completeness of the detected stellar content in the NIR, and thanks to a K-band polarimetric map, the internal ionisation model for the smaller component is predicted and the corresponding stellar counterpart is detected at 3.5 (mu)m. The spectral energy distribution and the presence of Br(gamma) emission in the stellar spectra translates into the possible presence of a supergiant as part of the population inside this UCHII. The confirmation of the existence of evolved stars in these objects is an evidence of longer lifetimes than expected by the simple expansion of the Strömgren sphere. Finally the study of the kinematical structure of G5.89-0.39, the paradigm of shell-type UCHII and most massive outflow of the Galaxy, reveals that the confirmed shocked molecular hydrogen emission is compatible with a north-south orientation of the outflow, whereas the ionised material seems to trace a secondary outflow structure and therefore a possible secondary star inside G5.89-0.39. The short dynamical age derived for this object (
Author : Ilaria Pascucci
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (249 download)
Download or read book Massive Star Formation at High Spatial Resolution written by Ilaria Pascucci and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ke Wang
Publisher : Springer
ISBN 13 : 3662449692
Total Pages : 160 pages
Book Rating : 4.6/5 (624 download)
Download or read book The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds written by Ke Wang and published by Springer. This book was released on 2014-11-03 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an in-depth, high-resolution observational study on the very beginning of the formation process: the fragmentation of dense molecular clouds known as infrared dark clouds (IRDCs). Using the Submillimeter Array (SMA) and Very Large Array (VLA) radio interferometers, the author has discovered a common picture of hierarchical fragmentation that challenges some of the leading theoretical models and suggests a new, observation-driven understanding of how massive star formation in clustered environments may begin: it is initiated by the hierarchical fragmentation of a dense filament from 10 pc down to 0.01 pc, and the stellar mass buildup is simultaneously fed by hierarchical accretion at similar scales. The new scenario points out the importance of turbulence and filamentary structure, which are now receiving increasing attention and further tests from both observers and theorists.
Author : Derek Ward-Thompson
Publisher : Cambridge University Press
ISBN 13 : 1139494473
Total Pages : 229 pages
Book Rating : 4.1/5 (394 download)
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.
Author : Paul A. Crowther
Publisher :
ISBN 13 :
Total Pages : 524 pages
Book Rating : 4.3/5 (91 download)
Download or read book Hot Star Workshop III : the Earliest Stages of Massive Star Birth written by Paul A. Crowther and published by . This book was released on 2002 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edvige Corbelli
Publisher : Taylor & Francis
ISBN 13 : 9781402034060
Total Pages : 584 pages
Book Rating : 4.0/5 (34 download)
Download or read book The Initial Mass Function 50 Years Later written by Edvige Corbelli and published by Taylor & Francis. This book was released on 2005-05-27 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of a conference held in celebration of the 50th anniversary of the introduction of the Initial Mass Function (IMF) concept by Ed Salpeter along with Ed Salpeter's 80th birthday. It provides a vast amount of information, and updates the Herstmonceux book on the IMF. This volume goes far beyond a regular proceedings in that it presents a large collection of long reviews on IMF determinations in the Galaxy, in galaxies, and in the Early Universe. In addition, the book includes reviews on the deep implications of the IMF on star formation theories, and on the physical conditions of the gas before and after star formation. As a consequence, the reader will find a lot of basic information needed for graduate courses on Stellar Evolution, Star Formation, Interstellar Medium, Galactic Dynamics, Formation and Evolution of Galaxies. The book covers all aspects of the current research in this field, as testified by the large number of contributing scientists.
Author : Erica June Nelson
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (11 download)
Download or read book The Spatial Distribution of Star Formation in Galaxies written by Erica June Nelson and published by . This book was released on 2019 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high resolution measurement of the distribution of star formation within galaxies is key to understanding the emergence of galactic structure. The aim of this thesis is to understand how the structure of galaxies is built by developing a new method to spatially resolve their star formation. Using Ha maps for 2676 galaxies, this thesis shows where star formation is distributed in galaxies during the epoch 0.7 z 1.5 when a third of the total star formation in the history of the universe occurred. Across the star formation rate - stellar mass plane (the "main sequence"), star formation is `spatially coherent': in galaxies with higher than average star formation rates, Ha is enhanced throughout the disk; similarly, in galaxies with low star formation rates Ha is depressed throughout the disk. This places constraints both on the mechanisms for enhancing and quenching star formation as well as on how the structure of galaxies is built. The disk scale length of star formation in galaxies is larger than that of the stars, a direct demonstration that the disks of galaxies grow inside-out. While most star formation in most galaxies occurs in disks, not all of it does. With the first spatially resolved measurement of the Balmer decrement at z 1, it can be seen that galaxies with M* 1010M have significant dust attenuation toward their centers. This means that we are witnessing the build-up of the dense stellar cores of massive galaxies through dust-obscured in-situ star formation. The most massive galaxies are thought to have formed their dense stellar cores at even earlier cosmic epochs. This thesis presents the first confirmed example of a massive galaxy core in the process of formation at z = 2.3. It has one of the highest velocity dispersions ever measured for a normal star forming galaxy and also appears to be building through very dense, dust-enshrouded star formation.
Author : Carlos M. Poventud Estrada
Publisher :
ISBN 13 :
Total Pages : 250 pages
Book Rating : 4.:/5 (434 download)
Download or read book Study of the Earliest Stages of High-mass Star Formation Through High-angular Resolution Spectral Line Observations written by Carlos M. Poventud Estrada and published by . This book was released on 2009 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven W. Stahler
Publisher : John Wiley & Sons
ISBN 13 : 3527618686
Total Pages : 865 pages
Book Rating : 4.5/5 (276 download)
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.
Author : Norbert S. Schulz
Publisher : Springer
ISBN 13 : 9783642441684
Total Pages : 0 pages
Book Rating : 4.4/5 (416 download)
Download or read book The Formation and Early Evolution of Stars written by Norbert S. Schulz and published by Springer. This book was released on 2014-06-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starburst regions in nearby and distant galaxies have a profound impact on our understanding of the early universe. This new, substantially updated and extended edition of Norbert Schulz’s unique book "From Dust to Stars" describes complex physical processes involved in the creation and early evolution of stars. It illustrates how these processes reveal themselves from radio wavelengths to high energy X-rays and gamma–rays, with special reference towards high energy signatures. Several sections devoted to key analysis techniques demonstrate how modern research in this field is pursued and new chapters are introduced on massive star formation, proto-planetary disks and observations of young exoplanets. Recent advances and contemporary research on the theory of star formation are explained, as are new observations, specifically from the three great observatories of the Spitzer Space Telescope, the Hubble Space Telescope and the Chandra X-Ray Observatory which all now operate at the same time and make high resolution space based observing in its prime. As indicated by the new title two new chapters have been included on proto-planetary disks and young exoplanets. Many more colour images illustrate attractive old and new topics that have evolved in recent years. The author gives updates in theory, fragmentation, dust, and circumstellar disks and emphasizes and strengthens the targeting of graduate students and young researchers, focusing more on computational approaches in this edition.
Author : Bo Reipurth
Publisher : University of Arizona Press
ISBN 13 : 9780816526543
Total Pages : 994 pages
Book Rating : 4.5/5 (265 download)
Download or read book Protostars and Planets V written by Bo Reipurth and published by University of Arizona Press. This book was released on 2007 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Protostars and Planets V' builds on the latest results from recent advances in ground and space-based astronomy and in numerical computing techniques to offer the most detailed and up-to-date picture of star and planet formation - including the formation and early evolution of our own solar system.
Author : International Astronomical Union. Symposium
Publisher : Cambridge University Press
ISBN 13 : 9780521874649
Total Pages : 564 pages
Book Rating : 4.8/5 (746 download)
Download or read book Astrophysical Masers and Their Environments (IAU S242) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2008-02-14 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astrophysical masers, naturally occurring microwave and radio-wave emissions, provide an important tool to investigate astrophysical environments. Several thousand maser sources have been observed in the interstellar medium and star formation regions, in the expanding winds from evolved stars, in the compressed shells of supernovae remnants, in comets and in the centers of galaxies. Masers are also useful for studying the structure and dynamics of our own galaxy, while masers in other galaxies are now used for cosmological studies and studies of galactic nuclei. This volume contains the latest research on the topic as presented at IAU Symposium 242, only the third international symposium on astrophysical masers. Over 125 astronomers from 18 different countries gathered in Alice Spring, Australia, for discussions on maser research.
Author : Ralph E. Pudritz
Publisher : Springer Science & Business Media
ISBN 13 : 9400929730
Total Pages : 652 pages
Book Rating : 4.4/5 (9 download)
Download or read book Galactic and Extragalactic Star Formation written by Ralph E. Pudritz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in the instrumentation used to observe star forming regions in both our own Milky Way and in external galaxies have transformed the subject from a phenomenological pursuit into an increasingly unified, physical science. High resolution centimetre, millimetre, infrared, and optical studies of local star forming clouds have allowed us to probe the physics of star formation down to spatial scales approaching those of the solar system. These developments make it possible to better constrain the basic physical processes underlying star formation itself. At the same time, these new instruments have placed extragalactic studies on a footing detailed enough to allow comparison with star forming regions within our own galaxy. This revolution means that we will soon be able to link the physics of local star forming regions to the global star forming properties of galaxies. The entire structure of this NATO Advanced Study Institute was designed to explore this new view of the subject. This Institute on "Galactic and Extragalactic Star Formation" was held from June 21 -July 4, 1987 at the Conference Centre in the village of Whistler, British Columbia, Canada. The informal atmosphere of this lovely mountain resort stim ulated many valuable scientific exchanges. The Institute was funded by a major grant from NATO Scientific Affairs. Additional financial and I.I1oral assistance was provided by the Canadian Institute for Theoretical Astrophysics (CITA) and Mc Master University.
Author : Charles J. Lada
Publisher : Springer Science & Business Media
ISBN 13 : 9401136424
Total Pages : 779 pages
Book Rating : 4.4/5 (11 download)
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.
Author : Vlas Sokolov
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Early Stages of Massive Star Formation written by Vlas Sokolov and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
