Sökning: "Photometric"

Visar resultat 1 - 5 av 40 uppsatser innehållade ordet Photometric.

  1. 1. Lithium abundances through distinct stellar populations in Omega Centauri

    Kandidat-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Brais Gesto Herrera; [2023]
    Nyckelord :;

    Sammanfattning : The renowned Omega Centauri (NGC 5139) is one of the most massive and complex known globular clusters in terms of multiple populations. In this project, we aim to investigate the chemical abundance of lithium in RBG stars in this cluster in pursuit of unraveling the that govern the formation of these distinct populations. LÄS MER

  3. 2. Finding the Seeds of Supermassive Black Holes: The Direct Collapse Black Hole Scenario

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Weihui Li; [2023]
    Nyckelord :;

    Sammanfattning : The origin of supermassive black holes (SMBHs,∼ 10^9M⊙) in the first billion years of cosmic history remains a mystery. Direct Collapse Black Holes (DCBHs,∼ 10^4M⊙) are considered one of the most promising hypotheses for the progenitor of SMBHs, as they are believed to provide a favorable starting point as massive seeds for SMBH formation. LÄS MER

  4. 3. Searching for direct collapse black holes using the James Webb Space Telescope

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Edison Arellano Almeida; [2022]
    Nyckelord :extragalactic astronomy;

    Sammanfattning : Recent detections of massive quasars at z > 6 has proven to be an interesting challengefor cosmology given the short time frame that these objects have to reach a certainmass via conventional methods (e.g., galaxy mergers). LÄS MER

  5. 4. The Metallicity Structure of the Milky Way Halo II : Characterising the distant halo substructure

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Amanda Byström; [2022]
    Nyckelord :Milky Way; Galactic archaeology; halo; photometric metallicities; stellar catalogue; Gaia-Enceladus-Sausage; Sagittarius; Pristine survey; metallicity; Gaia mission;

    Sammanfattning : The Milky Way galaxy, like all spiral galaxies, is surrounded by a roughly spherical distribution of stars called the halo. The halo was largely formed when the galaxy merged with smaller galaxies. LÄS MER

  7. 5. The magnetic field of phi Draconis

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Nikolaos Papakonstantinou; [2022]
    Nyckelord :stars: atmospheres – stars: chemically peculiar – stars: magnetic field – stars: starspots – stars: individual: phi Dra;

    Sammanfattning : Within this past decade, advances in spectropolarimetric analyses allowed mapping surface characteristics of nearby non-resolved stars with unique characteristics. In this study, we attempt mapping of the magnetic field structure and surface distribution of elements for such a star, the magnetic Ap star phi Dra. LÄS MER