Search for dissertations about: "astrometry"

Showing result 1 - 5 of 10 swedish dissertations containing the word astrometry.

2. 1. Galactic Structure Revealed by Space Astrometry

   Author : Johan Holmberg; Astronomi - Genomgår omorganisation; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomi; cosmic chemistry; Galactic structure; Milky Way Galaxy; Galactic kinematics and dynamics; Galactic chemical evolution; moving groups; solar neighbourhood; dark matter; astrometry; Hipparcos; space research; Astronomy; rymdvetenskap; kosmisk kemi; Space technology; Rymdteknik; Fysicumarkivet A:2001:Holmberg;

   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

4. 2. Tycho-Gaia and beyond: Combining data for precision astrometry

   Author : Daniel Michalik; Astronomi - Genomgår omorganisation; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; proper motions; parallaxes; positions; map of the Milky Way; joint solution; Gaia; detection of exo-planets; astrometry; catalogue combination; Tycho-Gaia Astrometric Solution; Hundred Thousand Proper Motion project; Fysicumarkivet A:2015:Michalik;

   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

5. 3. Studies of Double and Multiple Stars Using Space Astrometry

   Author : Carl Fredrik Quist; Astronomi - Genomgår omorganisation; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; cosmic chemistry; space research; brown dwarfs; Binaries; astrometric binaries; astrometry; Hipparcos; GAIA; Astronomy; data analysis; Astronomi; rymdvetenskap; kosmisk kemi; Fysicumarkivet A:2000:Quist;

   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

6. 4. Reading the Sky : From Starspots to Spotting Stars

   Author : Urban Eriksson; Cedric Linder; John Airey; Andreas Redfors; Edward E. Prather; Uppsala universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Astrometry; Astronomy Education Research; Disciplinary Discernment; Extrapolating three-dimensionality; Reading the Sky; Physics with specialization in Physics Education; Fysik med inriktning mot fysikens didaktik;

   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

7. 5. Radial Velocities Without Spectroscopy -Astrometric determination of stellar radial motion

   Author : Søren Madsen; Astronomi - Genomgår omorganisation; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomi; Hipparcos; Astronomy; space research; cosmic chemistry; astrometry; stellar astrophysics; N-body simulations; Open clusters and associations; cluster kinematics and dynamics; rymdvetenskap; kosmisk kemi;

   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