Search for dissertations about: "Hipparcos"
Showing result 1 - 5 of 6 swedish dissertations containing the word Hipparcos.
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1. Studies of Double and Multiple Stars Using Space Astrometry
Abstract : This thesis introduces and summarizes four papers dealing with the study of double and multiple stars using space astrometry. The introduction gives a brief review of the role of binary observations in various fields of astronomy --- star formation, stellar masses and the mass-luminosity relation, initial mass function, detection of sub-stellar mass companions. READ MORE
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2. Galactic Structure Revealed by Space Astrometry
Abstract : This work demonstrates how the structure of our Galaxy, the Milky Way, can be unveiled with the use of space astrometry. It consists of two parts, of which the first is a brief introduction to the fields of Galactic structure, covering the Galaxy's stellar constituents, how the Galaxy was formed and how it has evolved over time, both chemically and kinematically. READ MORE
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3. Radial Velocities Without Spectroscopy -Astrometric determination of stellar radial motion
Abstract : This work demonstrates the determination of absolute stellar radial velocities from geometrical principles, i.e. using astrometry. Such `astrometric radial velocities' are obtained independently of spectroscopic information. READ MORE
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4. Tycho-Gaia and beyond: Combining data for precision astrometry
Abstract : Astrometry aims at producing a three-dimensional map of positions and motions of stars and other celestial bodies in a consistent coordinate system covering the whole sky. This is best done from space, which provides a way of scanning the entire sky by a single instrument in a thermally stable environment. READ MORE
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5. Theoretical Studies of Binaries in Astrophysics
Abstract : This thesis introduces and summarizes four papers dealing with computer simulations of astrophysical processes involving binaries. The first part gives the rational and theoretical background to these papers. In paper I and II a statistical approach to studying eclipsing binaries is described. READ MORE