Sign-In
Cart
The Circumstellar Environment of Evolved Stars as Revealed by Studies of Circumstellar Water Masers
Paperback
ISBN13: 9781581120615
Publisher: Dissertation.com
Published: Dec 1 1996
Pages: 528
Weight: 1.46
Height: 1.18 Width: 5.50 Depth: 8.50
Language: English
The dissertation presents the results of a multi-epoch very long baseline interferometric study of water masers located in the extended atmospheres of evolved stars. The research was performed using the Very Long Baseline Array and Very Large Array of the National Radio Astronomy Observatory. Optical monitoring of the stars was provided by the American Association of Variable Star Observers, the Variable Star Network and Dr. Bill Neely of the NF/Observatory.
Water masers of found to exist in a region where a population inversion of the rotation transition of 22 GHz can be maintained by collisional pumping. The masers are identified as individual pockets of gas, which have the good velocity coherence and may be imaged using radio interferometry. Stellar winds are initiated in these sources by dust formation and acceleration of the gas through momentum coupling. The typical wind speeds in the region of the water masers are 10 to 20 km/s The water masers are followed through several epochs of observation and exhibit proper motions consistent with the assumed source distance and the measured outflow of velocity in the water maser region. Estimates of the distance to the sources using statistical approximation are in agreement with the currently accepted distances to the stars. A detailed kinematic model is used to describe the flow motions of the gas in the maser region. The regions are found to be complex and not well modeled by uniform radial outflow, radial outflow with rotation, or radial with acceleration. The reasons for this are explored and include anisotropic velocity fields induced through non-uniform dust formations near the star and incomplete sampling of the outflow due to a lack of detected masers. Possibilities for future work in the subject are described and include more sophisticated modeling, more sensitive observations, and analysis of other maser species.
Also in
Physics
The Formative Years of Relativity: The History and Meaning of Einstein's Princeton Lectures
Gutfreund, Hanoch
Renn, Jürgen
Hardcover
How It All Works: All Scientific Laws and Phenomena Illustrated & Demonstrated
Dant, Adam
Clegg, Brian
Hardcover
Feynman's Lost Lecture: The Motion of Planets Around the Sun [With CDROM]
Goodstein, David L.
Paperback
Lost in Space: 5,000 Facts for Navigating the Universe
Walker, Lindsey Nyx
Tyson, Neil Degrasse
Hardcover
The Edge of Space-Time: Particles, Poetry, and the Cosmic Dream Boogie
Prescod-Weinstein, Chanda
Hardcover
Beyond Darwin: How Epigenetics, Quantum Science, and Cooperation Shape Humanity's Future
Lipton, Bruce H.
Hardcover
What If? 10th Anniversary Edition: Serious Scientific Answers to Absurd Hypothetical Questions
Munroe, Randall
Hardcover
Astronomy 101, 2nd Edition: From Gravitational Waves and Merging Black Holes to New Exoplanets and Asteroid Samples, Key Theories, Discoveries, and Fa
Petersen, Carolyn Collins
Hardcover
5 Steps to a 5: AP Physics 1 2027: Practice AP Tests + AP Content Review + Digital Exams
Jacobs, Greg
Paperback
Just Visiting This Planet, Revised and Updated for the Twenty-First Century: Further Scientific Adventures of Merlin from Omniscia
Tyson, Neil Degrasse
Hardcover
My Big TOE Awakening Discovery Inner Workings: The Complete My Big TOE Trilogy Unifying Philosophy, Physics and Metaphysics
Campbell, Thomas
Hardcover
James Webb's Ancient Cosmos: A Journey to the Beginning of Time
Wild, Sarah
Phd Aderin, Maggie
Hardcover
Six Easy Pieces: Essentials of Physics Explained by Its Most Brilliant Teacher
Leighton, Robert B.
Sands, Matthew
Feynman, Richard P.
Paperback
Princeton Review AP Physics 1 Premium Prep, 13th Edition: 5 Practice Tests + Digital Practice Online + Content Review
The Princeton Review
Paperback
What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions
Munroe, Randall
Hardcover
A New Science of Heaven: How the New Science of Plasma Physics Is Shedding Light on Spiritual Experience
Temple, Robert
Paperback
AP Physics 1 Premium, 2027: Prep Book with 4 Practice Tests + Comprehensive Review + Online Practice
Wolf, Jonathan, M. a. Ed M.
Rideout, Kenneth, M. S.
Paperback
Take Me to Your Leader: Perspectives on Your First Alien Encounter (Large Print Edition)
Tyson, Neil DeGrasse
Hardcover
Time's Second Arrow: Evolution, Order, and a New Law of Nature
Hazen, Robert M.
Wong, Michael L.
Hardcover
The Rife Method Manual: 1,000+ Essential Rife Frequencies from A to Z and How to Use Them Safely and Effectively
Harkness, Aaron
Paperback
The Disordered Cosmos: A Journey Into Dark Matter, Spacetime, and Dreams Deferred
Prescod-Weinstein, Chanda
Paperback
The Black Book of Manifestation: Hidden Secrets & Forbidden Techniques to Shape Your Reality
Sharma, Sagar
Paperback
American Prometheus (Pulitzer Prize Winner): The Inspiration for the Major Motion Picture Oppenheimer
Sherwin, Martin J.
Bird, Kai
Paperback
Strange Angel: The Otherworldly Life of Rocket Scientist John Whiteside Parsons
Pendle, George
Paperback
Graph Paper Notebook 1/4 inch squares: Graph Paper Composition Book For Children and Women 8 x 10 inch, 122 Pages
Warren, Leann S.
Paperback
From Shiva to Schrödinger: Unravelling Cosmic Secrets with Trika Shaivism & Quantum Insights
Majumdar, Mrittunjoy Guha
Paperback
The Great Atom Debate: Ernst Mach, Ludwig Boltzmann, and the Battle for the Essence of Reality
Halpern, Paul
Hardcover
Zinn & the Art of Road Bike Maintenance, 6th Edition: The World's Best-Selling Bicycle Repair and Maintenance Guide
Zinn, Lennard
Paperback
Introduction to Live Sound Reinforcement: The Science, the Art, and the Practice
Boyce, Teddy
Paperback
Quantum Physics and Higher Consciousness: Unlocking the Mysteries of Reality and Awakening Your Inner Power
Silva, Mari
Hardcover
Why Nobody Understands Quantum Physics: The Story of the Science That Shapes Our World
Verstraete, Frank
Broeckaert, Céline
Hardcover
The Tao of Physics: An Exploration of the Parallels Between Modern Physics and Eastern Mysticism
Capra, Fritjof
Paperback
A Brief Welcome to the Universe: A Pocket-Sized Tour
Tyson, Neil Degrasse
Gott, J. Richard
Strauss, Michael A.
Paperback
Do Aliens Speak Physics?: And Other Questions about Science and the Nature of Reality
Whiteson, Daniel
Warner, Andy
Hardcover
Zinn and the Art of Mountain Bike Maintenance, 7th Edition: The World's Best-Selling Guide to Mountain Bike Repair
Zinn, Lennard
Paperback
Ways of Being: Animals, Plants, Machines: The Search for a Planetary Intelligence
Bridle, James
Paperback
My Big TOE Awakening Discovery Inner Workings: The Complete My Big TOE Trilogy Unifying Philosophy, Physics, and Metaphysics
Campbell, Thomas
Paperback
The Montauk Project - Experiments in Time: Silver Anniversary Edition
Moon, Peter
Nichols, Preston B.
Paperback
Quantum Mechanics Done Right: The Shortest Path from Novice to Researcher
Freericks, James K.
Hardcover
Smithsonian Atlas of Space: A Map to the Universe from the Big Bang to the Future
Launius, Roger D.
Hardcover
The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory
Greene, Brian
Paperback
Welcome to the Universe: An Astrophysical Tour
Strauss, Michael A.
Gott, J. Richard
Tyson, Neil Degrasse
Hardcover
Six Not-So-Easy Pieces: Einstein's Relativity, Symmetry, and Space-Time
Leighton, Robert B.
Sands, Matthew
Feynman, Richard P.
Paperback
The Theoretical Minimum: What You Need to Know to Start Doing Physics
Susskind, Leonard
Hrabovsky, George
Paperback
Fundamentals of Astrodynamics: Second Edition
Bate, Roger R.
Mueller, Donald D.
White, Jerry E.
Paperback
Let's Review Regents: Physical Science- Physics, Seventh Edition (Barron's NY Regents)
Tarendash, Albert, M. S.
Lazar, Miriam A., M. S.
Paperback
Regents Exams and Answers Physical Science Physics Fourth Edition (Barron's New York Regents)
Lazar, Miriam, M. S. Ed
Paperback
Unseen Universe: Space as You've Never Seen It Before from the James Webb Space Telescope
Harper, Caroline
Hardcover
Cosmos and Transcendence: Breaking Through the Barrier of Scientistic Belief
Smith, Wolfgang
Paperback
Do Your Ears Pop in Space? and 500 Other Surprising Questions about Space Travel
Mullane, R. Mike
Paperback
The Autobiography of Nikola Tesla and Other Works (Deluxe Leatherbound Edition)
Martin, Thomas Commerford
Tesla, Nikola
Hardcover
The Montauk Project - Experiments in Time: Silver Anniversary Edition
Nichols, Preston B.
Moon, Peter
Hardcover
Sounds Wild and Broken: Sonic Marvels, Evolution's Creativity, and the Crisis of Sensory Extinction
Haskell, David George
Paperback
The Fabric of Reality: The Science of Parallel Universes--And Its Implications
Deutsch, David
Paperback
AP Physics C Premium, Eighth Edition: 4 Practice Tests + Comprehensive Review + Online Practice (2026)
Pelcovits, Robert A., PH. D.
Farkas, Joshua, M. D.
Paperback
Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time
Gott, J. Richard
Paperback
Fantastic Numbers and Where to Find Them: A Journey to the Edge of Physics
Padilla, Antonio
Paperback
Alchemy of Nine Dimensions: Activating the Full Spectrum of Consciousness
Clow, Barbara Hand
Paperback
Signals from the Subatomic World: How to Build a Proton Precession Magnetometer
Hollos, Stefan
Hollos, Richard
Paperback
Analytic Idealism in a Nutshell: A Straightforward Summary of the 21st Century's Only Plausible Metaphysics
Kastrup, Bernardo
Paperback
Scale: The Universal Laws of Life, Growth, and Death in Organisms, Cities, and Companies
West, Geoffrey
Paperback
Cosmic Queries: Startalk's Guide to Who We Are, How We Got Here, and Where We're Going
Tyson, Neil Degrasse
Hardcover
Relativity: The Special and the General Theory - 100th Anniversary Edition
Einstein, Albert
Paperback
Until the End of Time: Mind, Matter, and Our Search for Meaning in an Evolving Universe
Greene, Brian
Paperback
Collisions: A Physicist's Journey from Hiroshima to the Death of the Dinosaurs
Nevala-Lee, Alec
Hardcover
Too Big for a Single Mind: How the Greatest Generation of Physicists Uncovered the Quantum World
Hürter, Tobias
Paperback
Princeton Review AP Physics C Premium Prep, 19th Edition: 4 Practice Tests + Digital Practice Online + Content Review
The Princeton Review
Paperback