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Author : Harold A. McAlister
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (72 download)
Download or read book Interferometric Methods Applied to Binary Stars written by Harold A. McAlister and published by . This book was released on 1993 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Douglas G. Currie
Publisher :
ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (227 download)
Download or read book Using Small Aperture Interferometry to Detect Planets in Nearby Binary Star Systems written by Douglas G. Currie and published by . This book was released on 1983 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: If suitably accurate binary star orbits can be observed, the effects of planets in the binary star system may be detectable in the reflex motion of the component binary stars. We show that interferometric measurements of binary star systems will provide this information. We discuss the effects of the atmosphere on degrading images and how interferometry will remove these effects to provide very accurate binary star positions relative to the other components in the binary system. Two systems, amplitude interferometry and speckle interferometry, can accomplish this using existing telescopes and techniques. With these methods, nearly accuracies of 0.00002 arc second are possible for binaries of 1 arc second separation and 10000 arc second for a 5 arc binary. These accuracies are more than enough to detect planets in orbits like Jupiter's out to over 20 pc. There are 188 observable systems within 20 pc, in most of which it is possible to have stable planetary orbits similar to solar system orbits. With advanced data recording systems it is possible to observe binary systems where the components are as faint as +16 stellar magnitudes. A dedicated 2-meter interferometric telescope to monitor binary stars could be built for about 1.4 million dollars. (Author).
Author : Harold A. McAlister
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.3/5 (91 download)
Download or read book Catalog of Interferometric Measurements of Binary Stars written by Harold A. McAlister and published by . This book was released on 1984 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harold A. McAlister
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.3/5 (91 download)
Download or read book Second Catalog of Interferometric Measurements of Binary Stars written by Harold A. McAlister and published by . This book was released on 1988 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harold-A. Mcalister
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (946 download)
Download or read book Misc\interfer written by Harold-A. Mcalister and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722760854
Total Pages : 48 pages
Book Rating : 4.7/5 (68 download)
Download or read book Second Catalog of Interferometric Measurements of Binary Stars (McAlister and Hartkopf 1988) written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The machine-readable version of the catalog, as it is currently being distributed from the Astronomical Data Center, is described. The catalog is a compilation of measurements of binary- and multiple-star systems obtained by speckle interferometric techniques; this version supersedes a previous edition of the catalog published in 1985. Stars that have been examined for multiplicity with negative results are included, in which case upper limits for the separation are given. The second version is expanded from the first in that a file of newly resolved systems and six cross-index files of alternate designations are included. The data file contains alternate identifications for the observed systems, epochs of observation, reported errors in position angles and separation, and bibliographical references. Warren, Wayne H., Jr. Goddard Space Flight Center ...
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (318 download)
Download or read book Precision Narrow-Angle Astrometry of Binary Stars with the Navy Prototype Optical Interferometer written by and published by . This book was released on 2004 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Navy Prototype Optical Interferometry (NPOI) group has started an astrometric search for planets in binary star systems based on the idea of using the binary components as position references for one another and looking for deviations from Keplerian motion. Our search will complement the radial velocity (vR) searches in three ways. We will observe stars of all spectral types; vR searches are limited to the FGKM range, where stars exhibit narrow spectral lines. We will search for planets in relatively large orbits (more than about 4 AU) where our method is most sensitive; vR searches are most sensitive to close-in planets. Finally, we will examine binary star systems, which with a few exceptions have been excluded from vR surveys. Our targets are binaries with both components in the interferometric field of view, producing a periodic variation in the fringe visibility (V 2) across the (u, v) plane. Past NPOI results from closer binaries (separations in the tens of mas) show residuals of tens of microarc-seconds about the best-fit orbits. The larger separations we are observing produce more V 2 oscillations across the (u, v) plane, offering the possibility of higher precision. We discuss the level of precision in test observations and the steps that will be needed to convert precision into accuracy.
Author : Kam-Ching Leung
Publisher :
ISBN 13 :
Total Pages : 504 pages
Book Rating : 4.:/5 (45 download)
Download or read book New Frontiers in Binary Star Research written by Kam-Ching Leung and published by . This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Niels Christian Smidth
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (96 download)
Download or read book Processing of Simulated and Experimental Images of Closely Spaced Binary Stars Using Speckle Interferometry written by Niels Christian Smidth and published by . This book was released on 2016 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory and methods of processing speckle interferometry data from close visual binary stars are presented and implemented. The effects of the optical systems used for observing close visual binary stars are explained and simulated from both the geometrical and physical optical viewpoints. The atmospheric phase distortion and shot noise responsible for the observed speckle patterns are simulated. The deconvolution technique originally presented by Labeyrie is implemented to extract astrometric data from close visual binary stars. This method is applied to both simulated and experimental data from Kitt Peak National Observatory as validation. Parts of the deconvolution process are optimized to allow for near real time calculations in an automated observatory.
Author : International Astronomical Union. Symposium
Publisher : Cambridge University Press
ISBN 13 : 9780521863483
Total Pages : 524 pages
Book Rating : 4.8/5 (634 download)
Download or read book Binary Stars as Critical Tools and Tests in Contemporary Astrophysics (IAU S240) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2007-08-27 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU S240 focuses on recent advances across the broad field of binary star research.
Author : Robert Hanbury Brown
Publisher : Taylor & Francis Group
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Intensity Interferometer written by Robert Hanbury Brown and published by Taylor & Francis Group. This book was released on 1974 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harold Alister McAlister
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (51 download)
Download or read book High Resolution Ground Based Astrometry of Binary Stars written by Harold Alister McAlister and published by . This book was released on 1991 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Speckle interferometry is providing measures of binary systems with separations down to 30 milliarcsec and with accuracies an order of magnitude improved over visual techniques. Speckle imaging methods are being tailored to differential photometry of binary stars so that individual magnitudes and colors determined with accuracies of + or - 0.02 magnitude will be available for large numbers of systems, a prerequisite to the full utilization of these objects for fundamental astrophysics. While speckle methods have penetrated into the observational gap separating 'visual' and 'spectroscopic' binaries, long-baseline interferometry will completely eliminate the observational distinction of these classes of systems. With limiting resolutions of a fraction of a milliarcsecond, interferometric arrays will resolve the majority of the known spectroscopic binaries.
Author : Benjamin F. Lane
Publisher : Universal-Publishers
ISBN 13 : 1581122004
Total Pages : 169 pages
Book Rating : 4.5/5 (811 download)
Download or read book High Precision Infra-Red Stellar Interferometry written by Benjamin F. Lane and published by Universal-Publishers. This book was released on 2003 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : D. R. Beddoes
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (93 download)
Download or read book The application of speckle interferometry to the astrometry of binary star systems written by D. R. Beddoes and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harold A. McAlister
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (72 download)
Download or read book Five Years of Double Star Interferometry and Its Lessons written by Harold A. McAlister and published by . This book was released on 1983 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: With nearly 1500 diffraction limited measurements of high accuracy to its credit, speckle interferometry must now be considered an established and productive method for performing binary star astrometry. This paper will attempt to give an explanation of the technique from the perspective of a binary star observer along with a general summary of the accomplishments that have given speckle interferometry its present respectability. Some recommendations aimed at increasing the effectiveness of the method will also be made. Speckle interferometry has provided valuable information on stellar diameters, and tantalizing results are beginning to appear for a variety of faint objects but only the application to the measurement of binary stars will be considered here.
Author : Tamás Borkovits
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (72 download)
Download or read book On the Formation of Close Binaries written by Tamás Borkovits and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both theoretical and indirect observational evidences suggest that most of the closest binary stars with orbital periods of few days (as well as hot Jupiter-type exoplanets) formed with an original separation larger by 1-2 orders of magnitude than the present one. Consequently, an orbital shrinking mechanism(s) must be present that extracts the angular momentum from a primordial binary. From the possible mechanisms studied in the literature we describe the so-called 'Kozai cycles combined with tidal friction' (KCTF), which gives some definite predictions for the statistical properties of the orbital elements in such close binaries. Due to the recent powerful observing techniques, such as optical and radio (VLBI) interferometry, we can already peer inside such close binaries, so we have some opportunity to check these predictions. We examine the practical details, constraints, restrictions about the inquiring of the necessary information from specific triple systems by interferometric (as well as polarimetric) observations. Finally, to illustrate this we give a brief description of our recent combined optical and radio interferometric measurements of Algol.
Author :
Publisher :
ISBN 13 :
Total Pages : 518 pages
Book Rating : 4.:/5 (319 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
