Sökning: "Galaxy: centre"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden Galaxy: centre.

  1. 1. Stellar Ages for Galactic Archaeology : Methods and Applications

    Författare :Christian Sahlholdt; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Galaxy : formation; Stellar ages; Milky Way Galaxy; Low mass stars; Galaxy : disc; Galaxy : evolution; Fysicumarkivet A:2021:Sahlholdt;

    Sammanfattning : Galactic Archaeology is the study of the formation and evolution of the Milky Way through the properties of stars and stellar populations. The combination of stellar ages, chemical compositions, positions, and velocities can reveal the history of star formation and chemical enrichment in different regions of the Galaxy. LÄS MER

  3. 2. Clues to galaxy evolution from spectroscopic observations of Galactic centre stars

    Författare :Brian Thorsbro; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemical abundances; Late-type stars; Star clusters; Galactic center; Galaxy chemical evolution; Chemical enrichment;

    Sammanfattning : In this work we present results from spectroscopic observations of Galactic centre stars. High resolution stellar spectroscopy can be used to determine accurate stellar metallicities and abundances. Observing stars in the Galactic centre is challenging due to extreme extinction. LÄS MER

  4. 3. Studies of molecular clouds at the Galactic centre

    Författare :Roland Karlsson; Kambiz Fathi; Aage Sandqvist; Andreas Eckart; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Galactic centre; Astronomy; astronomi;

    Sammanfattning : Interstellar molecular clouds play an essential role in the Universe. Such clouds are invoked for the production and destruction of stars, galaxies and gas and also for energy transport in galaxies. LÄS MER

  5. 4. Theoretical Studies of Binaries in Astrophysics

    Författare :Johann Dischler; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomi; Astronomy; Galaxy: centre; Stars: mass-loss; Binaries: close; Binaries: eclipsing;

    Sammanfattning : 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. LÄS MER

  7. 5. The spatial distribution of Lyman alpha from star-forming galaxies in the low redshift Universe

    Författare :Armin Rasekh; Göran Östlin; Roland Bacon; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lyman alpha; star-forming galaxies; Galaxy evolution; Epoch of Reionisation; galaxy morphology; Lyman continuum diagnostics; gas kinematics of galaxies; Astronomy; astronomi;

    Sammanfattning : The Lyman alpha (Lyα) emission line from the recombination of hydrogen atoms is predicted to be the strongest spectral feature of galaxies. This emission line is regularly used to detect and characterise high redshift galaxies. However, studying this spectral line is challenging. LÄS MER