Search for dissertations about: "Natural Sciences Physical Sciences Astronomy"
Showing result 1 - 5 of 364 swedish dissertations containing the words Natural Sciences Physical Sciences Astronomy.
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1. Reading the Sky : From Starspots to Spotting Stars
Abstract : This thesis encompasses two research fields in astronomy: astrometry and astronomy education and they are discussed in two parts. These parts represent two sides of a coin; astrometry, which is about constructing 3D representations of the Universe, and AER, where for this thesis, the goal is to investigate university students’ and lecturers’ disciplinary discernment vis-à-vis the structure of the Universe and extrapolating three-dimensionality. READ MORE
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2. Optical Turbulence Characterization for Ground-Based Astronomy
Abstract : The optical turbulence, which creates perturbations of the wavefronts coming from the stars, is caused by small-scale fluctuations in the index of refraction of the atmosphere and is a problem for astronomers because it limits the maximum resolution of the ground-based telescopes. One way of identifying the best sites to build astronomical observatories, where the influence of the optical turbulence is as small as possible, is to use the standard meteorological parameters to get a first idea of the potential of a site. READ MORE
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3. Physical properties of chromospheric features : Plage, peacock jets, and calibrating it all
Abstract : The chromosphere is a complex and dynamic layer of the solar atmosphere, largely dominated by the local magnetic field configuration. It acts as an important interface between the photosphere below it and the hot corona above. However, studying this layer is not straightforward, as it is largely transparent in optical wavelengths. READ MORE
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4. High Resolution Transmission Spectroscopy of Exoplanets
Abstract : A large number of exoplanets has been observed in the last three decades, but still for most of them we know comparatively little about the atmospheres of these distant planets. This is of particular interest as there exist types of planets that don't have an analogy in our own solar system, like hot Jupiters or super Earths. READ MORE
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5. Chemical Abundance Analysis of Population II Stars : The Summary Includes a Background in General Astronomy
Abstract : We are made of stardust in the sense that most atomic nuclei around us have been formed by stars. Stars synthesise new elements and expel them to the interstellar medium, from which later new generations of stars are born. We can map this chemical evolution by analysing the atmospheric contents of old Galactic halo stars. READ MORE
