High Angular Resolution Stellar Interferometry

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High Angular Resolution Stellar Interferometry

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Author :
language : en
Publisher:
Release Date : 1985

High Angular Resolution Stellar Interferometry written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Interferometry categories.

High Angular Resolution Stellar Interferometry

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Author : International Astronomical Union. Colloquium
language : en
Publisher:
Release Date : 1979

High Angular Resolution Stellar Interferometry written by International Astronomical Union. Colloquium and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Astronomical photometry categories.

High Angular Resolution Stellar Interferometry

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Author : J. C. Dainty
language : en
Publisher:
Release Date : 1982

High Angular Resolution Stellar Interferometry written by J. C. Dainty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.

The progress made an AFOSR grant 81-0003 is reviewed in six sections: 1. Space-time analysis of images, 2. Phase problem, one dimensional, 3. Phase problem, two dimensional, 4. Laboratory simulations, 5. Observational speckle and 6. Properties of atmospheric turbulence.

Nasa Reference Publication

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Author :
language : en
Publisher:
Release Date : 1990

Nasa Reference Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Astronautics categories.

Diffraction Limited Imaging With Very Large Telescopes

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Author : D.M. Alloin
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Diffraction Limited Imaging With Very Large Telescopes written by D.M. Alloin 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 2012-12-06 with Science categories.

A few years ago, a real break-through happened in observational astronomy: the un derstanding of the effect of atmospheric turbulence on the structure of stellar images, and of ways to overcome this dramatic degradation. This opened a route to diffraction-limited observations with large telescopes in the optical domain. Soon, the first applications of this new technique led to some outstanding astrophysical results, both at visible and infrared wavelengths. Yet, the potential of interferometric observations is not fully foreseeable as the first long-baseline arrays of large optical telescopes are being built or cOIIllnissioned right now. In this respect a comparison with the evolution of radio-astronomy is tempting. From a situation where, in spite of the construction of giant antennas, low angular resolution was prevailing, the introduction of long baseline and very long baseline interferometry and the rapid mastering of sophisticated image reconstruction techniques, have brought on a nearly routine basis high dynamic range images with milliarcseconds resolution. This, of course, has completely changed our views of the radio sky.

Reports On Astronomy

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Author : Edith Muller
language : en
Publisher: Springer Science & Business Media
Release Date : 1979-05-30

Reports On Astronomy written by Edith Muller 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 1979-05-30 with Science categories.

A Lunar Optical Ultraviolet Infrared Synthesis Array Louisa

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Author : Jack O. Burns
language : en
Publisher:
Release Date : 1992

A Lunar Optical Ultraviolet Infrared Synthesis Array Louisa written by Jack O. Burns and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Astronomical instruments categories.

Part 1 is an introduction. Part 2 is a description of current and planned ground-based interferometers. Part 3 is a description of potential space-based interferometers. Part 4 addresses the potential for interferometry on the moon. Part 5 is the report of the workshop's working groups. Concluding remarks, summary, and conclusions are presented in Part 6.

High Angular Resolution Stellar Interferometry

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Author : International Astronomical Union. Colloquium
language : en
Publisher:
Release Date : 1979

High Angular Resolution Stellar Interferometry written by International Astronomical Union. Colloquium and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Astronomical photometry categories.

Interferometry And Synthesis In Radio Astronomy

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Author : A. Richard Thompson
language : en
Publisher: Springer
Release Date : 2017-02-22

Interferometry And Synthesis In Radio Astronomy written by A. Richard Thompson and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-22 with Science categories.

This book is open access under a CC BY-NC 4.0 license. The third edition of this indispensable book in radio interferometry provides extensive updates to the second edition, including results and technical advances from the past decade; discussion of arrays that now span the full range of the radio part of the electromagnetic spectrum observable from the ground, 10 MHz to 1 THz; an analysis of factors that affect array speed; and an expanded discussion of digital signal-processing techniques and of scintillation phenomena and the effects of atmospheric water vapor on image distortion, among many other topics. With its comprehensiveness and detailed exposition of all aspects of the theory and practice of radio interferometry and synthesis imaging, this book has established itself as a standard reference in the field. It begins with an overview of the basic principles of radio astronomy, a short history of the development of radio interferometry, and an elementary discussion of the operation of an interferometer. From this foundation, it delves into the underlying relationships of interferometry, sets forth the coordinate systems and parameters to describe synthesis imaging, and examines configurations of antennas for multielement synthesis arrays. Various aspects of the design and response of receiving systems are discussed, as well as the special requirements of very-long-baseline interferometry (VLBI), image reconstruction, and recent developments in image enhancement techniques and astrometric observations. Also discussed are propagation effects in the media between the source and the observer, and radio interference, factors that limit performance. Related techniques are introduced, including intensity interferometry, optical interferometry, lunar occultations, tracking of satellites in Earth orbit, interferometry for remote Earth sensing, and holographic measurements of antenna surfaces. This book will benefit anyone who is interested in radio interferometry techniques for astronomy, astrometry, geodesy, or electrical engineering.

High Angular Resolution Studies Of The Structure And Evolution Of Protoplanetary Disks

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Author : Joshua Eisner
language : en
Publisher: Universal-Publishers
Release Date : 2005

High Angular Resolution Studies Of The Structure And Evolution Of Protoplanetary Disks written by Joshua Eisner and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.

Young stars are surrounded by massive, rotating disks of dust and gas, which supply a reservoir of material that may be incorporated into planets or accreted onto the central star. In this dissertation, I use high angular resolution observations at a range of wavelengths to understand the structure, ubiquity, and evolutionary timescales of protoplanetary disks. First, I describe a study of Class I protostars, objects believed to be at an evolutionary stage between collapsing spherical clouds and fully-assembled young stars surrounded by protoplanetary disks. I use a Monte Carlo radiative transfer code to model new 0.9 micron scattered light images, 1.3 mm continuum images, and broadband spectral energy distributions. This modeling shows that Class I sources are probably surrounded by massive protoplanetary disks embedded in massive infalling envelopes. For the best-fitting models of the circumstellar dust distributions, I determine several important properties, including envelope and disk masses, mass infall rates, and system inclinations, and I use these results to constrain the evolutionary stage of these objects. Second, I discuss observations of the innermost regions of more evolved disks around T Tauri and Herbig Ae/Be stars, obtained with the Palomar Testbed and Keck Interferometers. I constrain the spatial and temperature structure of the circumstellar material at sub-AU radii, and demonstrate that lower-mass stars are surrounded by inclined disks with puffed-up inner edges 0.1-1 AU from the star. In contrast, the truncated inner disks around more massive stars may not puff-up, indicating that disk structure depends on stellar properties. I discuss the implications of these results for disk accretion, terrestrial planet formation and giant planet migration. Finally, I put these detailed studies of disk structure into a broader context by constraining the mass distribution and evolutionary timescales of circumstellar disks. Using the Owens Valley Millimeter Array, I mapped the millimeter continuum emission toward >300 low-mass stars in the NGC 2024 and Orion Nebula clusters. These observations demonstrate that the average disk mass in each cluster is comparable to the "minimum-mass protosolar nebula," and that there may be disk evolution on one million year timescales.