Search for dissertations about: "stellar evolution"

Showing result 1 - 5 of 49 swedish dissertations containing the words stellar evolution.

  1. 1. On the Abundances of Li, Be and O in Metal-Poor Stars in the Galaxy

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Ana Elia García Pérez; Uppsala universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy; galactic evolution; stellar abundances; stellar atmospheres; spectral line formation; stellar mixing; Astronomi; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik;

    Abstract : Stellar atmospheres constitute excellent environments to study the chemical evolution of our Galaxy. The chemical composition of these atmospheres reflects the composition of the gas from where these stars were born. READ MORE

  2. 2. Dwarf and Subgiant Stars as Probes of Galactic Chemical and Dynamical Evolution

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Patrik Thorén; Uppsala universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy; Abundances; atomic data; Galactic evolution; late-type stars; main sequence stars; subgiants; Pop II; Pop I; stellar evolution; Astronomi; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik; astronomi; Astronomy;

    Abstract : Stellar chemical abundances provide astronomers with vital information about the production of chemical elements. Some stars preserve the composition of the environment in which they were born on their surfaces. READ MORE

  3. 3. On the Winds of Carbon Stars and the Origin of Carbon A Theoretical Study

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lars Mattsson; Uppsala universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB stars; carbon stars; mass loss; stellar winds; circumstellar matter; cosmic dust; stellar evolution; nucleosynthesis; galactic chemical evolution; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik; Astronomy; Astronomi; Fysik; Physics;

    Abstract : Carbon is the basis for life, as we know it, but its origin is still largely unclear. Carbon-rich Asymptotic Giant Branch (AGB) stars (carbon stars) play an important rôle in the cosmic matter cycle and may contribute most of the carbon in the Galaxy. READ MORE

  4. 4. Determination of stellar ages and star formation histories - a Bayesian approach With an application to nearby F and G stars

    University dissertation from KFS AB

    Author : Bjarne Rosenkilde Jørgensen; Lunds universitet.; Lund University.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomi; Astronomy; Galaxy evolution; Statistical methods; Stellar evolution; Data analysis;

    Abstract : Popular Abstract in Swedish Ett av de viktigaste målen för astronomin är att förstå var vi kommer ifrån. Det är naturligtvis många steg som skall förstås, och vart och ett av dessa steg i människans för-förhistoria är komplicerat, så man skall inte förvänta sig att en enskild doktorsavhandling behandlar mer än ett litet hörn av ett av dessa steg. READ MORE

  5. 5. On the Chemical Composition of Metal-Poor Stars Impact of Stellar Granulation and Departures from Local Thermodynamic Equilibrium on the Formation of Spectral Lines

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Remo Collet; Uppsala universitet.; [2006]
    Keywords : Astronomy; late-type stars; stellar abundances; stellar atmospheres; spectral line formation; convection; hydrodynamics; Galactic chemical evolution; Astronomi;

    Abstract : The information about the chemical compositions of stars is encoded in their spectra. Accurate determinations of these compositions are crucial for our understanding of stellar nucleosynthesis and Galactic chemical evolution. READ MORE