Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Astrometry"”.
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A long baseline optical interferometer for astrometry.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Precision geodesy and astrometry via very-long-baseline interferometry.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1974. Ph.D.
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Spectro-astrometry as a Tool for Detecting Planets in Transitional Disks
… we investigate the possibility of using spectro-astrometry to detect planets around young stars. UVES spectra of T Cha were obtained with a spectro-astrometric study in mind, and the technique is also tested by applying it to UVES spectra of HD 142527, a young Herbig Ae/Be star with a known brown …
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The role of binary stars in searches for extrasolar planets by microlensing and astrometry
When Galactic microlensing events of stars are observed, one usually measures a symmetric light curve corresponding to a single lens, or an asymmetric light curve, often with caustic crossings, in the case of a binary lens system. In principle, the fraction of binary stars at a certain separation …
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A mathematical model of building daylighting based on first principles of astrometry, solid geometry and optical radiation transfer
… the inside of a room based on the principles of astrometry, solid geometry, and radiation transfer. This study discusses and analyzes certain aspects critical to develop a mathematical model for evaluating daylight performance and compares the results of the proposed model with 48 scale model …
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Astrometria, efemérides e ocultações estelares de satélites irregulares e corpos do sistema solar exterior
… in collaboration with foreign researchers, the astrometry, ephemeris production and stellar occultation prediction by irregular satellites, the first stellar occultation by an irregular satellite (Phoebe) ever observed, the astrometry of the Neptune- Triton system and the prediction work of the …
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Gravitational Lensing in the Solar Neighbourhood and Towards the Milky Way Bulge
… that are relatively unexplored. Leveraging astrometry from the Gaia satellite, I search for predicted close stellar alignments by lenses in the solar neighbourhood that will give rise to a microlensing event. Using Near-Infrared (NIR) photometry from the Vista Variables in the Via Lactea …
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How to Accurately Map the Milky Way with a Billion Sources: A Journey into the Gaia-verse
… functions for Gaia catalogues including astrometry and RVS samples. My model fits the complex behaviour of the Gaia spacecraft impressively well. To enhance our understanding of the published Gaia astrometry, I introduce the Astrometric Spread Function, the expected covariance for a …
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The effect of differential color refraction on astrometric observations of Solar System bodies and Earth satellites from ground-based optical telescopes
… and the systematic error ŕoor in ground-based astrometry is deőned by DCR.
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Characterization and mitigation of radiation damage on the Gaia Astrometric Field
… of over a billion stars. Microarcsecond astrometry requires extremely accurate positional measurements of individual stellar transits on the focal plane, which can be disrupted by radiation-induced Charge Transfer Inefficiency (CTI). Gaia will suffer radiation damage, impacting on the …
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Characterising the Gravitationally Lensed Quasar Population
… gravitationally lensed quasar systems to obtain astrometry and multi-band photometry. We were then able to take the astrometry and model the lenses which resulted in us being able to determine the magnifications and model time delays. We were also able to combine the magnifications with the …
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UBV photometry of close visual double stars using an area scanner
… the field of visual double star photometry and astrometry.
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High-Contrast Observations with an Integral Field Spectrograph
… takes advantage of the high-precision relative astrometry enabled by a pupil plane reticle grid. This tool, in combination with the spectrophotometric capability of the integral field spectrograph, reveal that the A5V star Alcor has a heretofore unknown M-dwarf companion. In my third chapter, I …
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Stochastic performance analysis and staged control system designs for space based interferometers
… missions have the potential to revolutionize astrometry, providing observations of unprecedented accuracy. Realizing the full potential of these interferometers poses several significant technological challenges. One of the most significant challenges is regulating the light pathlength, from …
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Evaluation, design, and construction of the Wallace Astrophysical Observatory Camera for astronomical observations
… scanning surveys, and Kuiper Belt Object (KBOs) astrometry to be obtained using the 24" telescope.
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THE IMPACT OF TRIPLE STELLAR SYSTEMS ON PROTOSTELLAR DISC DYNAMICS
… multiple stellar systems within discs, while astrometry is becoming more sensitive. The present capabilities offer us the opportunity to develop a comprehensive theory for disc and planet formation in multiple stellar systems and prepare our models for forthcoming observational data. …
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The Astrometric Contribution of Unresolved Stellar Companions
… turn to indirect methods to infer its presence. Astrometry, the mapping of the motion of stars across the sky, is one such method. A significant mass concentrated in one or more collapsed companions will perturb the path. In the simplest and most ubiquitous case, a binary system, this …
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Binary star systems and extrasolar planets
… to perform very high precision differntial astrometry on bright binary stars with separations in the range of 0.1 - 1.0 arcseconds. Typical measurement precisions over an hour of integration are on the order of 10 micro-arcseconds (as), enabling one to look for perturbations to the Keplerian …
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