50 Years Of Brown Dwarfs
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50 Years Of Brown Dwarfs
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Author : Viki Joergens
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-27
50 Years Of Brown Dwarfs written by Viki Joergens and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-27 with Science categories.
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.
New Light On Dark Stars
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Author : Neill I. Reid
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-27
New Light On Dark Stars written by Neill I. Reid and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-27 with Science categories.
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.
On The Origin And Nature Of Brown Dwarfs And Massive Planets
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Author : Ingo Thies
language : en
Publisher:
Release Date : 2011
On The Origin And Nature Of Brown Dwarfs And Massive Planets written by Ingo Thies and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Very Low Mass Stars And Brown Dwarfs
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Author : Rafael Rebolo
language : en
Publisher: Cambridge University Press
Release Date : 2000-11-27
Very Low Mass Stars And Brown Dwarfs written by Rafael Rebolo and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-11-27 with Science categories.
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.
Brown Dwarf Companions To Young Solar An
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Author : Stanimir Metchev
language : en
Publisher: Universal-Publishers
Release Date : 2006-02
Brown Dwarf Companions To Young Solar An written by Stanimir Metchev and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-02 with Science categories.
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.
Brown Dwarfs
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Author : S. R. Kulkarni
language : en
Publisher:
Release Date : 1997
Brown Dwarfs written by S. R. Kulkarni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Stars categories.
A Search For Pulsation In Young Brown Dwarfs And Very Low Mass Stars
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Author : Ann Marie Cody
language : en
Publisher: Universal-Publishers
Release Date : 2013-08
A Search For Pulsation In Young Brown Dwarfs And Very Low Mass Stars written by Ann Marie Cody and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08 with Science categories.
In 2005, Palla & Baraffe proposed that brown dwarfs and very low mass stars (
An Introduction To Brown Dwarfs Failed Stars And Super Jupiters
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Author : John Gizis
language : en
Publisher:
Release Date : 2024-11-15
An Introduction To Brown Dwarfs Failed Stars And Super Jupiters written by John Gizis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-11-15 with Science categories.
Brown Dwarfs
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Author : International Astronomical Union. Symposium
language : en
Publisher: Astronomical Society of the Pacific
Release Date : 2003
Brown Dwarfs written by International Astronomical Union. Symposium and has been published by Astronomical Society of the Pacific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Brown dwarf stars categories.
Evolution Of Brown Dwarfs
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Author : Sen-Ben R. Liao
language : en
Publisher:
Release Date : 1989
Evolution Of Brown Dwarfs written by Sen-Ben R. Liao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.