Download or read book Very Low Mass Stars and Brown Dwarfs written by Rafael Rebolo and published by Cambridge University Press. This book was released on 2000-11-27 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a state-of-the-art review of our current knowledge of brown dwarfs and very low-mass stars. The hunt for and study of these elusive objects is currently one of the most dynamic areas of research in astronomy for two reasons. Brown dwarfs bridge the gap between stars and planets, and they may constitute an important part of the 'dark matter' of the Universe. This volume presents review articles from a team of international authorities who gathered at a conference in La Palma to assess the spectacular progress that has been made in this field in the last few years.
Download or read book New Light on Dark Stars written by Neill I. Reid and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perhaps the most common question that a child asks when he or she sees the night sky from a dark site for the first time is: 'How many stars are there?' This happens to be a question which has exercised the intellectual skills of many astronomers over the course of most of the last century, including, for the last two decades, one of the authors of this text. Until recently, the most accurate answer was 'We are not certain, but there is a good chance that almost all of them are M dwarfs. ' Within the last three years, results from new sky-surveys - particularly the first deep surveys at near infrared wavelengths - have provided a breakthrough in this subject, solidifying our census of the lowest-mass stars and identifying large numbers of the hitherto almost mythical substellar-mass brown dwarfs. These extremely low-luminosity objects are the central subjects of this book, and the subtitle should be interpreted accordingly. The expression 'low-mass stars' carries a wide range of meanings in the astronomical literature, but is most frequently taken to refer to objects with masses comparable with that of the Sun - F and G dwarfs, and their red giant descendants. While this definition is eminently reasonable for the average extragalactic astronomer, our discussion centres on M dwarfs, with masses of no more than 60% that of the Sun, and extends to 'failed stars' - objects with insufficient mass to ignite central hydrogen fusion.
Download or read book 50 Years of Brown Dwarfs written by Viki Joergens and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The years 2012/2013 mark the 50th anniversary of the theoretical prediction that Brown Dwarfs, i.e. degenerate objects which are just not massive enough to sustain stable hydrogen fusion, exist. Some 20 years after their discovery, how Brown Dwarfs form is still one of the main open questions in the theory of star formation. In this volume, the pioneers of Brown Dwarf research review the history of the theoretical prediction and the subsequent discovery of Brown Dwarfs. After an introduction, written by Viki Joergens, reviewing Shiv Kumar's theoretical prediction of the existence of brown dwarfs, Takenori Nakano reviews his and Hayashi's calculation of the Hydrogen Burning Minimum Mass. Both predictions happened in the early 1960s. Jill Tarter then writes on the introduction of the term 'Brown Dwarf', before Ben Oppenheimer, Rafael Rebolo and Gibor Basri describe their first discovery of Brown Dwarfs in the 1990s. Lastly, Michael Cushing and Isabelle Baraffe describe the development of the field to the current state of the art. While the book is mainly aimed at the Brown Dwarf research community, the description of the pioneering period in a scientific field will attract general readers interested in astronomy as well.
Download or read book Brown Dwarf Companions to Young Solar an written by Stanimir Metchev and published by Universal-Publishers. This book was released on 2006-02 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results from an adaptive optics survey conducted with the Palomar and Keck telescopes over 3 years, which measured the frequency of stellar and sub-stellar companions to Sun-like stars. The survey sample contains 266 stars in the 3-10000 million year age range at heliocentric distances between 8 and 200 parsecs and with spectral types between F5-K5. A sub-sample of 101 stars, between 3-500 million years old, were observed in deep exposures with a coronagraph to search for faint sub-stellar companions. A total of 288 candidate companions were discovered around the sample stars, which were re-imaged at subsequent epochs to determine physical association with the candidate host stars by checking for common proper motion. Benefitting from a highly accurate astrometric calibration of the observations, we were able to successfully apply the common proper motion test in the majority of the cases, including stars with proper motions as small as 20 milli-arcseconds/year. The results from the survey include the discovery of three new brown dwarf companions (HD 49197B, HD 203030B, and ScoPMS 214B), 43 new stellar binaries, and a triple system. The physical association of an additional, a priori-suspected, candidate sub-stellar companion to the star HII 1348 is astrometrically confirmed. The newly-discovered and confirmed young brown dwarf companions span a range of spectral types between M5 and T0.5, and will be of prime significance for constraining evolutionary models of young brown dwarfs and extra-solar planets. Based on the 3 new detections of sub-stellar companions in the 101 star sub-sample and following a careful estimate of the survey incompleteness, a Bayesian statistical analysis shows that the frequency of 0.012-0.072 solar-mass brown dwarfs in 30-1600 AU orbits around young solar analogs is 6.8% (-4.9%, +8.3%; 2-sigma limits). While this is a factor of 3 lower than the frequency of stellar companions to G-dwarfs in the same orbital range, it is significantly higher than the frequency of brown dwarfs in 0-3 AU orbits discovered through precision radial velocity surveys. It is also fully consistent with the observed frequency of 0-3 AU extra-solar planets. Thus, the result demonstrates that the radial-velocity "brown dwarf desert" does not extend to wide separations, contrary to previous belief.
Download or read book Our Neighbor Stars written by Thomas Wm Hamilton and published by Strategic Book Publishing. This book was released on 2012-02 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sky's the limit in the fascinating book Our Neighbor Stars: Including Brown Dwarfs. The book presents all known information on the 100 stars nearest Earth, as well as the brown dwarfs within the range covered by these stars. Learn where (and whether) the stars are visible in the sky, who discovered them and how they were discovered. Read all about the stars' sizes, colors, presence of any planets, and the constellations where the stars are located. All the information is indexed, so particular types of stars can be easily found. About the Author: Thomas Wm. Hamilton has wanted to work in astronomy since he was five years old. Now retired, he taught astronomy for 32 years, and has worked for the Apollo program and in the planetarium field. His last book was Useful Star Names and his next is an anthology featuring his science fiction stories. The author grew up in San Francisco and now resides on Staten Island, New York. Publisher's Website: http: //sbpra.com/ThomasWmHamilton
Download or read book A Search for Pulsation in Young Brown Dwarfs and Very Low Mass Stars written by Ann Marie Cody and published by Universal-Publishers. This book was released on 2013-08 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2005, Palla & Baraffe proposed that brown dwarfs and very low mass stars (
Download or read book New Light on Dark Stars written by Neil Reid and published by Springer. This book was released on 2009-09-02 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been very considerable progress in research into low-mass stars, brown dwarfs and extrasolar planets during the past few years, particularly since the fist edtion of this book was published in 2000. In this new edtion the authors present a comprehensive review of both the astrophysical nature of individual red dwarf and brown dwarf stars and their collective statistical properties as an important Galactic stellar population. Chapters dealing with the observational properies of low-mass dwarfs, the stellar mass function and extrasolar planets have been completely revised. Other chapters have been significantly revised and updated as appropriate, including important new material on observational techniques, stellar acivity, the Galactic halo and field star surveys. The authors detail the many discoveries of new brown dwarfs and extrasolar planets made since publication of the first edition of the book and provide a state-of-the-art review of our current knowledge of very low-mass stars, brown dwarfs and extrasolar planets, including both the latest observational results and theoretical work.
Download or read book New Light on Dark Stars written by I. Neill Reid and published by . This book was released on 2000 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perhaps the most common question that a child asks when he or she sees the night sky from a dark site for the first time is: 'How many stars are there?' This happens to be a question which has exercised the intellectual skills of many astronomers over the course of most of the last century, including, for the last two decades, one of the authors of this text. Until recently, the most accurate answer was 'We are not certain, but there is a good chance that almost all of them are M dwarfs. ' Within the last three years, results from new sky-surveys - particularly the first deep surveys at near infrared wavelengths - have provided a breakthrough in this subject, solidifying our census of the lowest-mass stars and identifying large numbers of the hitherto almost mythical substellar-mass brown dwarfs. These extremely low-luminosity objects are the central subjects of this book, and the subtitle should be interpreted accordingly. The expression 'low-mass stars' carries a wide range of meanings in the astronomical literature, but is most frequently taken to refer to objects with masses comparable with that of the Sun - F and G dwarfs, and their red giant descendants. While this definition is eminently reasonable for the average extragalactic astronomer, our discussion centres on M dwarfs, with masses of no more than 60% that of the Sun, and extends to 'failed stars' - objects with insufficient mass to ignite central hydrogen fusion.
Download or read book Introduction to Brown Dwarfs written by John Gizis and published by AAS-IOP Astronomy. This book was released on 2022-12-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Astroquizzical the Illustrated Edition written by Jillian Scudder and published by . This book was released on 2021-09-28 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Introduction to Brown Dwarfs Failed Stars and Super Jupiters written by John Gizis and published by . This book was released on 2024-11-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultracool Dwarfs written by Hugh R.A. Jones and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once you have looked at the night sky on a moonless night it is not hard to realise why so much of our science and religion has its roots in the stars. Yet it took until 1850 to realise that fainter stars were not necessarily further away, nor the brighter ones closer. In fact within the magnitude range observable to the naked eye it is probable that the brighter star is in fact further away. Even today the measurement of stellar distances is relatively difficult and is gener ally only done using dedicated telescopes. In the early years of the 20th century Hertzsprung and Russell developed a powerful classification diagram which al lows stars to be distinguished using a plot of their colour versus magnitude. The construction of this diagram involved the use of spectroscopy which has become the cornerstone of modern astronomy. As telescopes become more powerful, de tectors more sensitive and more physics is added to astrophysics, astronomical spectroscopy becomes a more powerful tool. The concern of this book is the spectral classification of stars. With a single spectrum of a star it is possible to uniquely classify an object and find its place on the Hertzsprung-Russell diagram. This spectrum is thus equivalent to having the colour and the magnitude of the object which can in turn be related to mass and other quantities.
Download or read book Red Dwarfs written by David S. Stevenson and published by Springer Nature. This book was released on 2019-09-11 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thought-provoking book looks at the nature of red dwarf systems as potential homes for life. Realistically, what are the prospects for life on these distant worlds? Could life evolve and survive there? How do these planetary surfaces and geologies evolve? How would life on a planet orbiting a red dwarf differ from life on Earth? And what are the implications for finding further habitable worlds in our galaxy? The author provides readers with insight into the habitability of planets and how this changes as time progresses and the central star evolves. Since the previous 2013 edition Under a Crimson Sun, there has been a rise in newly discovered planets orbiting red dwarfs, accompanied by controversial areas of research that test what we think we know about these systems. This revised edition delves into the wealth of new material uncovered since that date. It explains the often conflicting results and analyses put forward and clarifies our understanding of these exciting new worlds. The chapters explore the full width of relevant scientific discovery and speculation on the potential for red dwarf planets to host life. New content includes improved atmospheric models, new understandings of the impact of stellar radiation on the atmosphere of red dwarf worlds, tidal-locking, and comparisons with terrestrial geology and climate.
Download or read book Bang to Eternity and Betwixt written by John Hussey and published by John Hussey. This book was released on 2014-07-31 with total page 3555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the Cosmos from before the Big Bang through to the creation of our universe and up to but not including our arrival on stage; our will is not yet imposed, we had no hand, act nor part in its provisions, beyond investigating to understand what has been delivered us. The many aspects of the Cosmos are melded, in a headline driven style, to paint a cohesive picture as well as allowing the reader choose to delve further where they may choose to paint their personal picture. Cosmos – includes; • The creation mechanism for our Universe and why there exists a possible Multiverse. • The creation mechanisms of the galaxies with their diversity of Star types. • The space exploration of our Solar System. • The Earth and Moon from their birth to their life driving engines for our planet. • The evolutionary processes that led to our arrival on the planet. • Our natural world with its great events. • Documentary video links on all topics of the book are included. The story is factual in manner, in the proper tradition of reporting, no personal opinions are expressed. The life stories of the standout personalities, in text and video, without whom what is now known, could not have been unraveled, in the case of Cosmos, they are; • Galileo Galilei • Isaac Newton • Albert Einstein • Charles Darwin This is a Video Book, vBook, beyond its text there are 150+ video titles, 100+ viewing hours, downloaded and stored locally on your computer, to be able to watch anytime, offline, without the need for local internet connection. Google ‘Cosmos’ and you get about 27,800,000 search results, so over these last several years I’ve searched out the best documentary videos with their hyperlinks included here, blending their content to report cohesively, supplementing, where appropriate, from Wikipedia and also include those hyperlinks for readers wanting to delve further. The ‘List of Contents’ runs to 6 levels to provide a form of map to the reader as the reporting sequence is not a mere chronology of Cosmic events, it delves, as necessary into the stories as to how the events became understood to us. There is a 7th level, hyperlinked, at its base, which brings further background content, from Wikipedia, to those who choose to read further into any of the topics. The ‘Index’ allows navigation for the reader who has specific interests to investigate through the fabric of the report. The ‘Text’ is structured to 4 levels beginning with the primary, headline driven, main body content followed by relevant Wikipedia extracts, indented in purple, for those choosing to read further into a particular topic through to hyperlinked Wikipedia - Full Article text within the book and in turn out to the website itself. For the reader that wants to stay with the big picture, main body content, there is a “Skip” link to take you past each of the extracts, on to the next headline title and main body content. There are 150+ video content links delivering 100+ hours of viewing time, of the best documentary film available online. The main sequence structure is; • Cosmology – Universe & Multiverse • Geology – Earth & Moon • Biology – Life – Plant & Animal • Ecology – Evolution & Environment – Plant, Animal & Human Special Edition There is also a Special Edition of this book available for US$49.95 which streams all video content from a secure Cloud Drive; therefore, video content cannot be removed by third party video platform providers such as YouTube, DailyMotion, Vimeo….. This Standard Edition streams from these. The Cloud Drive Server also allows you conveniently download to your local drive, as much video content as you choose, to watch, offline, at a time that best suits you. To view or purchase, paste the books ASIN: B00LEWY5WW into the Kindle Store search box. If you've any queries, feel welcome to contact [email protected]
Download or read book From Cosmological Structures to the Milky Way written by Siegfried Röser and published by John Wiley & Sons. This book was released on 2006-12-13 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 18 continues the Reviews in Modern Astronomy with twelve invited reviews and highlight contributions which were presented during the International Scientific Conference of the Astronomical Society on the topic "From Cosmological Structures to the Milky Way", held in Prague, Czech Republic, September 20 to 25, 2004. The contributions to the meeting published in this volume discuss, among other subjects, X-ray astronomy, cosmology, star formation and the Galactic Centre.
Download or read book Atlas of Astronomical Discoveries written by Govert Schilling and published by Springer Science & Business Media. This book was released on 2011-04-11 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a unique combination of informative text, magnificent illustrations and stylish design Examines the 100 most important discoveries since the invention of the telescope Features spectacular photographs, taken with the largest telescopes on Earth and in space, that portray distant corners of the universe Author Govert Schilling is a renowned astronomy journalist and science communicator In his Atlas of Astronomical Discoveries, astronomy journalist Govert Schilling tells the story of 400 years of telescopic astronomy. He looks at the 100 most important discoveries since the invention of the telescope. Doing what Schilling does best, he takes the reader on an adventure through both space and time. Photographs and amazing pictures line the pages of this book, offering the reader an escape from this world and an invitation to a world far beyond what the unaided human eye can detect.
Download or read book Highlights of Astronomy written by Derek McNally and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is the customary practice to report the major events of a General Assembly -the Invited Discourses, Joint Discussions and Joint Commission Meetings in Highlights of Astronomy. Vol. 8 reports the highlights of the XXth General Assembly of the International Astronomical Union, 1988 August 2-11, Baltimore, USA. The present volume contains the 3 Invited Discourses and papers presented at 7 Joint Discussion Meetings and 6 Joint Commission Meetings. Two Joint Commission Meetings will be reported elsewhere -JCM5 Spectroscopy of Individual Stars in Globular Clusters and the Early Chemical Evolution of our Galaxy (in summary only here, published by the Imprimerie de l'Observatoire de Paris) and JCM7 Star Clusters in the Magellanic Clouds (see Transactions of the IAU, Vol.XXB, report of Commission 37). I am most grateful to the authors of the invited discourses R.M. West and V.I. Moroz, M. Schmidt and M. Rees for sending me the manuscripts so promptly. I am also indebted to the Chairmen of the Joint Discussion and Joint Commission Meetings for their organisation of the meetings and for the assembly of their material for publication. Unfortunately the deadline for receipt of manuscripts coincided with an extended postal strike in France which seriously hindered the preparation of the volume for publication.
