♥ Book Title : Constraining Disk Parameters of Be Stars Using Narrowband Halpha Interferometry With the Navy Prototype Optical Interferometer
☯ Full Synopsis :Interferometric observations of two well-known Be stars, gamma Cas and phi Per, were collected and analyzed to determine the spatial characteristics of their circumstellar regions. The observations were obtained using the Navy Prototype Optical Interferometer equipped with custom-made narrowband filters. The filters isolate the H(alpha) emission line from the nearby continuum radiation, which results in an increased contrast between the interferometric signature due to the H(alpha)-emitting circumstellar region and the central star. Because the narrowband filters do not significantly attenuate the continuum radiation at wavelengths 50 nm or more away from the line, the interferometric signal in the H(alpha) channel is calibrated with respect to the continuum channels. The observations used in this study represent the highest spatial resolution measurements of the H -emitting regions of Be stars obtained to date. These observations allow us to demonstrate for the first time that the intensity distribution in the circumstellar region of a Be star cannot be represented by uniform disk or ringlike structures, whereas a Gaussian intensity distribution appears to be fully consistent with our observations."Article☾ ☽ Statement ..."
✩ Constraining Disk Parameters Of Be Stars Using Narrowband Halpha Interferometry With The Navy Prototype Optical Interferometer ✩
Top results of your surfing
✪ Constraining Disk Parameters Of Be Stars Using Narrowband Halpha Interferometry With The Navy Prototype Optical Interferometer ✪ Start Download Portable Document Format (PDF) and E-books (Electronic Books) Free Online Rating News 2016/2017 is books that can provide inspiration, insight, knowledge to the reader.
♥ Book Title : Databases On line Data in Astronomy
☯ Full Synopsis :Data archiving has, for many years, been the most disregarded aspect of all data systems. The increase in numbers of telescopes, both groundbased and space-borne, and the increase in efficiency of detectors have generated overwhelming amounts of data. Much of these data were and are not used on short timescales and (should) have been archived, where they can be used later and/or by others. Archiving is essential. Objects can change in the course of time. New technological or scientific developments might require observing objects again. The cost-benefit ratio will become more and more important when considering the allocation of telescope time. The retrieval of `old' data can then be crucial. At present there are a number of data collections and data retrieval systems. This book includes a series of clear and up-to-date descriptions of many important available data systems. For professional astronomers, librarians and computer engineers."Article☾ M.A Albrecht☽ Statement ..."
♥ Book Title : The Astrophysics of Emission Line Stars
☯ Full Synopsis :Emission line stars are attractive to many people because of their spectacular phenomena and their amazing varieties and variability. This book offers general information on emission line stars, starting from a brief introduction to stellar astrophysics and then moving to a broad overview of emission line stars including early and late type stars as well as pre-main sequence stars."Article☾ Tomokazu Kogure☽ Statement ..."
♥ Book Title : Introduction to Astronomy and Cosmology
☯ Full Synopsis :Introduction to Astronomy & Cosmology is a modern undergraduate textbook, combining both the theory behind astronomy with the very latest developments. Written for science students, this book takes a carefully developed scientific approach to this dynamic subject. Every major concept is accompanied by a worked example with end of chapter problems to improve understanding Includes coverage of the very latest developments such as double pulsars and the dark galaxy. Beautifully illustrated in full colour throughout Supplementary web site with many additional full colour images, content, and latest developments."Article☾ Ian Morison☽ Statement ..."
♥ Book Title : The intensity interferometer
☯ Full Synopsis :"Article☾ Robert Hanbury Brown☽ Statement ..."
♥ Book Title : The Physics of the Interstellar Medium Second Edition
☯ Full Synopsis :The book leads the advanced undergraduate through the wide range of disciplines related to an understanding of the interstellar medium and is suitable for any student studying either physics or astrophysics. The study of the interstellar medium incorporates a large range of physical More...processes on both large and small scales all of which are covered in this text. Together with the inclusion of simple models and problems at the end of each chapter this text provides a comprehensive overview and grounding in the study of the interstellar medium."Article☾ J.E Dyson☽ Statement ..."
♥ Book Title : Parallax
☯ Full Synopsis :In the dramatic tradition of the best-selling Longitude, Parallax charts the historical path of observational astronomy's most daunting challenge: measuring the distance to a star. The greatest scientific minds applied themselves in vain to the problem across the millennia, beginning with the ancient Greeks. Not until the nineteenth century would three astronomers, armed with the best telescopes of the age, race to conquer this astronomical Everest—their contest ending in a virtual dead heat. Against a sweeping backdrop filled with kidnappings, dramatic rescue, swordplay, madness, and bitter rivalry, Alan Hirshfeld brings to life the heroes of this remarkable story. Meet the destitute boy plucked from a collapsed building who becomes the greatest telescope maker the world has ever seen; the hot-tempered Dane whose nose is lopped off in a duel over mathematics; the merchant's apprentice forced to choose between the lure of money and his passion for astronomy; and the musician who astounds the world by discovering a new planet from his own backyard. Generously illustrated with diagrams, period engravings, and paintings, Parallax is an unforgettable tale that illuminates the distinctly human side of science."Article☾ Alan W. Hirshfeld☽ Statement ..."
♥ Book Title : Astrophysics Processes
☯ Full Synopsis :Bridging the gap between physics and astronomy textbooks, this book provides step-by-step physical and mathematical development of fundamental astrophysical processes underlying a wide range of phenomena in stellar, galactic, and extragalactic astronomy. The book has been written for upper-level undergraduates and beginning graduate students, and its strong pedagogy ensures solid mastery of each process and application. It contains over 150 tutorial figures, numerous examples of astronomical measurements, and 201 exercises. Topics covered include the Kepler–Newton problem, stellar structure, binary evolution, radiation processes, special relativity in astronomy, radio propagation in the interstellar medium, and gravitational lensing. Applications presented include Jeans length, Eddington luminosity, the cooling of the cosmic microwave background (CMB), the Sunyaev–Zeldovich effect, Doppler boosting in jets, and determinations of the Hubble constant. This text is a stepping stone to more specialized books and primary literature. Password-protected solutions to the exercises are available to instructors at www.cambridge.org/9780521846561."Article☾ Hale Bradt☽ Statement ..."
♥ Book Title : A Guide to Experiments in Quantum Optics
☯ Full Synopsis :This revised and broadened second edition provides readers with an insight into this fascinating world and future technology in quantum optics. Alongside classical and quantum-mechanical models, the authors focus on important and current experimental techniques in quantum optics to provide an understanding of light, photons and laserbeams. In a comprehensible and lucid style, the book conveys the theoretical background indispensable for an understanding of actual experiments using photons. It covers basic modern optical components and procedures in detail, leading to experiments such as the generation of squeezed and entangled laserbeams, the test and applications of the quantum properties of single photons, and the use of light for quantum information experiments."Article☾ Hans-A. Bachor☽ Statement ..."
♥ Book Title : Philip s Astronomy Encyclopedia
☯ Full Synopsis :Many encyclopedia entries (from aberration to ZZ Ceti star) authenticated by a team of respected academics. Colour illustrations, photographs, artworks, and tables. Star Maps created by Wil Tirion."Article☾ Patrick Moore☽ Statement ..."