Search for dissertations about: "astrometric"

Showing result 1 - 5 of 15 swedish dissertations containing the word astrometric.

  2. 1. Characterization and analysis of the astrometric errors in the global astrometric solution for Gaia

    Author : Berry Holl; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astrometry; Catalogs; Methods: data analysis; statistical; numerical; analytical; Space vehicles: instruments; Instrumentation: detectors;

    Abstract : The space astrometry mission Gaia, planned for launch in 2013 by the European Space Agency (ESA), will provide the most comprehensive and accurate catalogue of astrometric data for galactic and astrophysical research in the coming decades. It will observe roughly one billion stars, quasars and other point like objects for which the five astrometric parameters (position, parallax and proper motion) will be determined. READ MORE

  4. 2. Stellar Surface Structures and the Astrometric Serach for Exoplnaets

    Author : Urban Eriksson; Lindegren Lennart; Kristianstad University; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astrometry; astronomy;

    Abstract : Measuring stellar parallax, position and proper motion is the task of astrometry. With the development of new and much more accurate equipment, different noise sources are likely to affect the very precise measurements made with future instruments. READ MORE

  5. 3. Stellar surface structures and the astrometric search for exoplanets

    Author : Urban Eriksson; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Not available.... READ MORE

  6. 4. 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

  7. 5. 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