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Author: Neill I. Reid Publisher: Springer Science & Business Media ISBN: 1447136632 Category : Science Languages : en Pages : 492
Book Description
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.
Author: Neill I. Reid Publisher: Springer Science & Business Media ISBN: 1447136632 Category : Science Languages : en Pages : 492
Book Description
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.
Author: David S. Stevenson Publisher: Springer Nature ISBN: 3030255506 Category : Science Languages : en Pages : 376
Book Description
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.
Author: David S. Stevenson Publisher: Springer Science & Business Media ISBN: 1461481333 Category : Science Languages : en Pages : 331
Book Description
Gliese 581 is a red dwarf star some 20.3 light years from Earth. Red dwarfs are among the most numerous stars in the galaxy, and they sport diverse planetary systems. At magnitude 10, Gliese 581 is visible to amateur observers but does not stand out. So what makes this star so important? It is that professional observers have confirmed that it has at least four planets orbiting it, and in 2009, Planet d was described in the letters of The Astrophysical Journal as “the first confirmed exoplanet that could support Earth-like life.” Under a Crimson Sun looks at the nature of red dwarf systems such as Gliese as potential homes for life. Realistically, what are prospects for life on these distant worlds? Could life evolve and survive there? How do these planetary surfaces and geology evolve? How would life on a red dwarf planet differ from life on Earth? And what are the implications for finding further habitable worlds in our galaxy? Stevenson provides readers with insight into the habitability of planets and how this changes as time progresses and the central star evolves. Explore with him in this engaging, fascinating book the possibilities for finding life, from bacteria to more complex and even intelligent organisms, on red dwarf system planets.
Author: Robert Stetson Publisher: BookCountry ISBN: 146300267X Category : Fiction Languages : en Pages : 276
Book Description
Number two of the Red Dwarf novels. Read the continuing adventures of Clay Stone. This is the continuing story of a Starship Captain who embarks on a stellar mission to a red dwarf star called Alpha Proxima 4.2 light years away on a starship named, "The Beast". He is accompanied by his new wife, Mandy. The trip is a disaster and the trials and tribulations are many, but Omni Fleet Academy is almost doomed near the end. The story is packed full of humor, romance, action and adventure. You're going to love this one too. But, PLEASE, don't tell anyone the ending.
Author: Siegfried Böhme Publisher: Springer Science & Business Media ISBN: 3662123223 Category : Science Languages : en Pages : 949
Book Description
Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months: This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. I, 1980; some older Volume 27 contains literature published in 1980 and received before August literature which was received late and which is not recorded in earlier volumes is also included. We acknowledge with thanks contributions to this volume by Dr. J. Bouska, Prague, who surveyed journals and publications in Czech and supplied us with abstracts in English.
Author: Jim Lebans Publisher: McClelland & Stewart ISBN: 0771050038 Category : Science Languages : en Pages : 258
Book Description
For everyone who’s curious about what’s new under (and over and around) the stars. Douglas Adams famously pronounced in The Hitchhiker’s Guide to the Galaxy that the answer to life, the universe, and everything was 42. Quirks & Quarks, whose approach to science owes almost as much to Adams as it does to Newton or Einstein or Hawking, have flipped that notion through a gap in the space-time continuum (or something like that) and come up with answers to the 42 essential questions about space. Much about the universe is very hard for most of us to grasp, and if anyone can explain these mind-bending aspects of the heavens above, it’s the Quirks & Quarks producers, who have been bringing Canadians understandable science, with trademark humour, for more than thirty years. In their Guide to Space, they answer such pressing questions as Where does space begin? Why is most of the universe missing? Is there intelligent life in the universe? And the real puzzler: What came before the Big Bang? They also answer questions we wish we’d thought to ask, such as Can you surf a gravity wave? and Why is the universe’s temperature on my TV? There are answers as well to far more practical questions, like What happens when you fall into a black hole? and How will the universe end? The answers, which have been vetted by a team of astronomers, are witty, authoritative, in-depth, accurate, up-to-date astronomically, and, of course, quirky.
Author: Neill I. Reid
Author: Neill I. Reid
Author: David S. Stevenson
Author: David S. Stevenson
Author: Robert Stetson
Author: Robert Jastrow
Author: Siegfried Böhme
Author: Siegfried Böhme
Author: Roald Gershberg
Author: Barry R. PARKER
Author: Jim Lebans