High Precision Infra Red Stellar Interferometry

Author : Benjamin F. Lane
Publisher : Universal-Publishers
Page : 169 pages
File Size : 48,5 Mb
Release : 2003
Category : Science
ISBN : 9781581122008

Get Book

High Precision Infra-Red Stellar Interferometry by Benjamin F. Lane Pdf

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 : Hans Ulrich Käufl,R. Siebenmorgen,Alan F.M. Moorwood
Publisher : Springer Science & Business Media
Page : 588 pages
File Size : 41,5 Mb
Release : 2005-07-18
Category : Science
ISBN : 3540252568

Get Book

High Resolution Infrared Spectroscopy in Astronomy by Hans Ulrich Käufl,R. Siebenmorgen,Alan F.M. Moorwood Pdf

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 : C. Eiroa,A. Alberdi,Harley A. Thronson Jr.,T. de Graauw,C.J. Schalinski
Publisher : Springer Science & Business Media
Page : 333 pages
File Size : 50,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401154680

Get Book

Infrared Space Interferometry: Astrophysics & the Study of Earth-Like Planets by C. Eiroa,A. Alberdi,Harley A. Thronson Jr.,T. de Graauw,C.J. Schalinski Pdf

The past year has produced some of the most exciting results in the history of astronomy, particularly in the area of planets outside our solar system. Only a half-year before our meeting in Toledo, Spain, the first unambiguous detection of planet-sized masses orbiting main sequence stars were reported. Since that time, evidence for a new exo planet has been reported almost at the rate of about once per month. Some of these objects are likely to turn out to be very low-mass stars, but something like half show characteristics - Jupiter-like mass and near-zero orbital eccentricity - which appear to be unique to planets. Almost at the same time that giant planets were being discovered regularly, the two major space agencies, ESA and NASA, have iden tified searches for and detailed study of Earth-like planets as a major priority for the future. In ESA's "Horizon 2000 Plus" programme, an infrared interferometer has been proposed as a possible future Cor nerstone mission. Similarly, scientists in the US produced the "Road Map for the Exploration of Neighboring Planetary Systems (ExNPS)", which provided NASA with a long-term plan which leads also to an infrared interferometer in space to study hypothetical Earth-like worlds beyond our Solar System. Such an observatory is designed to search for the thermal emission from a family of planets, using interferometric nulling to remove the contaminating light from the central star.

Author : Anonim
Publisher : Unknown
Page : 854 pages
File Size : 54,6 Mb
Release : 2024-07-01
Category : Military research
ISBN : STANFORD:36105211293035

Get Book

Air Force Research Resumés by Anonim Pdf

Author : J.G. Robertson,W.J. Tango
Publisher : Springer Science & Business Media
Page : 505 pages
File Size : 52,9 Mb
Release : 2013-12-01
Category : Science
ISBN : 9789401108805

Get Book

Very High Angular Resolution Imaging by J.G. Robertson,W.J. Tango Pdf

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 : A. Lagrange,Denis Mourard,Pierre Léna
Publisher : Springer Science & Business Media
Page : 404 pages
File Size : 51,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400900417

Get Book

High Angular Resolution in Astrophysics by A. Lagrange,Denis Mourard,Pierre Léna Pdf

Over the last decade many efforts have been made to develop high angular resolution techniques in astrophysics. Combined with imaging facilities, they have rapidly proved their efficiency and have already led to major astrophysical results. During the decade to come, astronomers will be offered new, even more sophisticated high angular resolution tools, especially in the IR and optical domains, coupled with much bigger telescopes, either on the ground or in space. In such a context of rapidly evolving techniques and a growing need for higher angular resolution to test theories or discover new objects, the present book reviews both instrumental and scientific aspects. The main questions addressed are: what kind of science will benefit from high angular resolution techniques? How can they best be used? Audience: The book is accessible to students and research workers in both instrumental and astrophysical aspects.

Author : Anonim
Publisher : Unknown
Page : 490 pages
File Size : 42,6 Mb
Release : 1990
Category : Astronautics
ISBN : UOM:39015023291621

Get Book

NASA Reference Publication by Anonim Pdf

Author : International Astronomical Union. Colloquium
Publisher : Unknown
Page : 516 pages
File Size : 43,9 Mb
Release : 1979
Category : Astronomical photometry
ISBN : UIUC:30112077809405

Get Book

High Angular Resolution Stellar Interferometry by International Astronomical Union. Colloquium Pdf

Author : Ian S. McLean
Publisher : Springer Science & Business Media
Page : 607 pages
File Size : 45,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401110709

Get Book

Infrared Astronomy with Arrays by Ian S. McLean Pdf

The idea for another conference on the theme of Infrared Astronomy with Arrays actually goes back to March 1987. At a party held in my home at the end of the Hilo conference, excitement was running high and everyone present was in favor of another meeting. I recall suggesting to Al Fowler that the next meeting could be in Tucson. Despite Al's reply to the effect that Hawaii was a much nicer location, a meeting was held in Tucson three years later. That meeting focussed more on the astrophysics which had been accomplished with the detectors, rather than on techniques and methods. However, it was already apparent in February of 1990 that a new generation of larger m arrays would soon supersede the 64x64 class of devices and so, having just moved from the UK Infrared Telescope unit in Hawaii to join with Eric Becklin in his move to UCLA, it seemed to me that another Hilo-style conference was appropriate, and Eric agreed.

Author : U. Esser,H. Hefele,Inge Heinrich,W. Hofmann,D. Krahn,V. R. Matas,Dr. Lutz D. Schmadel,G. Zech
Publisher : Springer Science & Business Media
Page : 1266 pages
File Size : 41,9 Mb
Release : 2013-11-11
Category : Science
ISBN : 9783662123645

Get Book

Literature 1988, Part 1 by U. Esser,H. Hefele,Inge Heinrich,W. Hofmann,D. Krahn,V. R. Matas,Dr. Lutz D. Schmadel,G. Zech Pdf

From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews#1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#2

Author : Anonim
Publisher : Unknown
Page : 488 pages
File Size : 45,6 Mb
Release : 1995
Category : Aeronautics
ISBN : MINN:30000006324622

Get Book

Scientific and Technical Aerospace Reports by Anonim Pdf

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Author : Anonim
Publisher : Unknown
Page : 568 pages
File Size : 49,5 Mb
Release : 1983
Category : Science
ISBN : IND:30000133151922

Get Book

Mosaic by Anonim Pdf

Author : Astronomisches Rechen-Institut
Publisher : Springer Science & Business Media
Page : 1308 pages
File Size : 55,7 Mb
Release : 2013-06-29
Category : Science
ISBN : 9783662123676

Get Book

Literature 1988, Part 2 by Astronomisches Rechen-Institut Pdf

From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews#1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#2

Author : Henri M. J. Boffin,Gaitee Hussain,Jean-Philippe Berger,Linda Schmidtobreick
Publisher : Springer
Page : 274 pages
File Size : 45,7 Mb
Release : 2016-08-24
Category : Science
ISBN : 9783319397399

Get Book

Astronomy at High Angular Resolution by Henri M. J. Boffin,Gaitee Hussain,Jean-Philippe Berger,Linda Schmidtobreick Pdf

This book offers an essential compendium of astronomical high-resolution techniques. Recent years have seen considerable developments in such techniques, which are critical to advances in many areas of astronomy. As reflected in the book, these techniques can be divided into direct methods, interferometry, and reconstruction methods, and can be applied to a huge variety of astrophysical systems, ranging from planets, single stars and binaries to active galactic nuclei, providing angular resolution in the micro- to tens of milliarcsecond scales. Written by experts in their fields, the chapters cover adaptive optics, aperture masking imaging, spectra disentangling, interferometry, lucky imaging, Roche tomography, imaging with interferometry, interferometry of AGN, AGN reverberation mapping, Doppler- and magnetic imaging of stellar surfaces, Doppler tomography, eclipse mapping, Stokes imaging, and stellar tomography. This book is intended to enable a next generation of astronomers to apply high-resolution techniques. It informs readers on how to achieve the best angular resolution in the visible and near-infrared regimes from diffraction-limited to micro-arcsecond scales.

Author : Raymond Y. Chiao
Publisher : Springer Science & Business Media
Page : 675 pages
File Size : 52,6 Mb
Release : 2012-12-06
Category : Science
ISBN : 9781461223788

Get Book

Amazing Light by Raymond Y. Chiao Pdf

This Festschrift is a collection of essays contributed by students, colleagues, and ad mirers to honor an eminent scholar on a special anniversary: Charles Hard Townes on the occasion of his 80th birthday, July 28, 1995. In 1964, Townes shared the Nobel Prize in physics with Alexander Mikhailovich Prokhorov and Nikolai Gen nadyevich Basov "for fundamental work in the field of quantum electronics, which has led to the construction of oscillators and amplifiers based on the maser-laser principle. " His contributions have covered a much wider area, however. His fruitful interests spanning several decades have included many scientific subjects, includ ing, microwave spectroscopy and astrophysics (other articles in this volume will expand further on this point). He has also contributed to public service, having served as the chairman of the Science and Technology Advisory Committee for NASA's Apollo program, and as a member and vice chairman of the President's Science Advisory Committee. As the enormous breadth of contributions from his students shows, he has educated scholars who are now in a wide range of fields. The contributions from his many admirers, among whom are nine fellow Nobel laureates, attest to his impact on many disciplines ranging from electrical engi neering to medicine. His influence extends even to theology, as is indicated by one essay. The broadly international character of this Festschrift reflects his deep belief in the international, universal nature of science.