High Angular Resolution Techniques in Infrared Astronomy Applied to the Study of Late-type Stars with Circumstellar Dust PDF Download
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Author: Jeffrey Joseph Sudol
Publisher:
ISBN:
Category : Circumstellar matter
Languages : en
Pages : 348
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Author: Jeffrey Joseph Sudol
Publisher:
ISBN:
Category : Circumstellar matter
Languages : en
Pages : 348
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Author: Marshall Dimsey Perrin
Publisher:
ISBN:
Category :
Languages : en
Pages : 718
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Author: Hans Ulrich Käufl
Publisher: Springer Science & Business Media
ISBN: 9783540252566
Category : Science
Languages : en
Pages : 588
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Book Description
Two specialized new instruments for ESO's VLT, VISIR and CRIRES, spawned the idea for this workshop. CRIRES is a dedicated very high resolution infrared spectrograph; VISIR features a high resolution spectroscopic mode. Together, the instruments combine the sensitivity of an 8m-telescope with the now well-established reliability of VLT-facility instruments. High resolution here means that lines in cool stellar atmospheres and HII-regions can be resolved. The astrophysical topics discussed in this rather specialized workshop range from the inner solar system to active galactic nuclei. There are many possibilities for new discoveries with these instruments, but the unique capability, which becomes available through high-resolution infrared spectroscopy, is the observation of molecular rotational-vibrational transitions in many astrophysical environments. Particularly interesting and surprising in this context, many papers on modeling and laboratory spectroscopy at the workshop appear to indicate that astronomical observations are lagging a bit behind in this field. The papers are an interesting mix of reports from existing high resolution facilities, reports on modeling efforts of synthetic spectra and reports on laboratory spectra. In this sense, a fruitful exchange between molecular physics and astronomy was again accomplished and is documented in this volume.
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1166
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Author: J.G. Robertson
Publisher: Springer Science & Business Media
ISBN: 9401108803
Category : Science
Languages : en
Pages : 505
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Book Description
The 1990s are proving to be a very exciting p&iod for high angular resolution astronomy. At radio wavelengths a combination of new array instruments and pow erful imaging algorithms have generated images of unprecedented resolution and quality. In the optical and infrared, the great technical difficulties associated with constructing separated-aperture interferometers have been largely overcome, and many new instruments are now operating or are being developed. As these pro grams start to produce observational results they will be able to draw extensively on the experience gained by the radio-interferometry community. Thus it seemed that the time was ripe for a meeting which would bring together workers from all wavelength ranges to discuss the details of the science and art of "Very High Angular Resolution Imaging" . While the main emphasis of Symposium No. 158 was on high resolution tech niques from the radio, mm-wave, infrared and optical bands, it also provided an opportunity for presentation of astronomical results from these techniques. As well as giving our colleagues from the Northern Hemisphere a break from midwinter, the location of the Symposium in Australia recognised the continuing development of astronomical interferometry in this country, especially the recent completion of the Australia Telescope radio array, and the progress toward com missioning of the Sydney University Stellar Interferometer. A number of the par ticipants visited these instruments during the post-symposium tour.
Author: Ian S. Glass
Publisher: Cambridge University Press
ISBN: 9780521633857
Category : Nature
Languages : en
Pages : 200
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Book Description
A clear and concise practical handbook on all aspects of infrared astronomy, for graduate students, researchers and keen amateurs.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 868
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Author: Benjamin F. Lane
Publisher: Universal-Publishers
ISBN: 1581122004
Category : Science
Languages : en
Pages : 169
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Book Description
This dissertation describes work performed at the Palomar Testbed Interferometer (PTI) during 1998-2002. Using PTI, we developed a method to measure stellar angular diameters in the 1-3 milli-arcsecond range with a precision of better than 5%. Such diameter measurements were used to measure the mass-radius relations of several lower main sequence stars and hence verify model predictions for these stars. In addition, by measuring the changes in Cepheid angular diameters during the pulsational cycle and applying a Baade-Wesselink analysis we are able to derive the distances to two galactic Cepheids (h Aql & z Gem) with a precision of 10%; such distance determinations provide an independent calibration of the Cepheid period-luminosity relations that underpin current estimates of cosmic distance scales. Second, we used PTI and the adaptive optics facility at the Keck Telescope on Mauna Kea to resolve the low mass binary systems BY Dra and GJ 569B, resulting in dynamical mass determinations for these systems. GJ 569B most likely contains at least one sub-stellar component, and as such represents the first dynamical mass determination of a brown dwarf. Finally, a new observing technique, dual star phase referencing, was developed and demonstrated at PTI. Phase referencing allows interferometric observations of stars previously too faint to observe, and is a prerequisite for large-scale interferometric astrometry programs such as the one planned for the Keck Interferometer; interferometric astrometry is a promising technique for the study of extra-solar planetary systems, particularly ones with long-period planets.
Author: Wolfgang Brandner
Publisher: Springer Science & Business Media
ISBN: 9783540250340
Category : Science
Languages : en
Pages : 412
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Book Description
The field of Adaptive Optics (AO) for astronomy has matured in recent years, and diffraction-limited image resolution in the near-infrared is now routinely achieved by ground-based 8 to 10m class telescopes. This book presents the proceedings of the ESO Workshop on Science with Adaptive Optics held in the fall of 2003. The book provides an overview on AO instrumentation, data acquisition and reduction strategies, and covers observations of the sun, solar system objects, circumstellar disks, substellar companions, HII regions, starburst environments, late-type stars, the galactic center, active galaxies, and quasars. The contributions present a vivid picture of the multitude of science topics being addressed by AO in observational astronomy.
Author: International Astronomical Union. Colloquium
Publisher:
ISBN:
Category : Astronomical photometry
Languages : en
Pages : 516
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Book Description
