Sökning: "metallicity"
Visar resultat 6 - 10 av 25 avhandlingar innehållade ordet metallicity.
6. A study of possible chemical inhomogeneities of dwarf irregular galaxies and the influence on the Z-L relationship
Sammanfattning : A study on the chemical abundances of dwarf irregular galaxies (dI's) is presented in this work. This type of galaxies have typically low metallicity. First of all, a definition of dI is proposed, in order to obtain a homogeneous group of targets. LÄS MER
7. A study of the new dwarf spheroidal galaxy in Hercules - metallicity and a stellar inventory
Sammanfattning : Not available.... LÄS MER
8. Photometry of Resolved Stellar Populations in Local Group Galaxies
Sammanfattning : This thesis presents results from two projects using photometric observations to investigate stellar populations in Local Group galaxies. In the first project, Strömgren photometry is used to study stellar populations in dwarf spheroidal galaxies. LÄS MER
9. A study of the Hercules dwarf spheroidal galaxy
Sammanfattning : Parts of large spiral galaxies, such as the Milky Way and Andromeda, are believed to have formed from the accretion of several smaller galaxies. Remnants of this chaotic merging era, such as dwarf spheroidal (dSph) galaxies, are visible in the outskirts of large galaxies. LÄS MER
10. Clues to galaxy evolution from spectroscopic observations of Galactic centre stars
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