Sökning: "Stellar Spectroscopy"

Visar resultat 11 - 15 av 26 uppsatser innehållade orden Stellar Spectroscopy.

  1. 11. Detailed chemical abundances of neutron-capture elements - from 523 local giant stars

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Rebecca Forsberg; [2019]
    Nyckelord :The Milky Way galaxy; Abundances; High-resolution spectroscopy; Neutron-capture elements; Physics and Astronomy;

    Sammanfattning : Purpose: The purpose of this work is to determine the abundances of neutron-capture elements in solar neighborhood giant stars. This enables constraints to be put on the the cosmic origin of these elements. LÄS MER

  3. 12. Spectroscopy of the Globular Cluster M30

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Kilian Hikaru Scheutwinkel; [2019]
    Nyckelord :Spectroscopy; Globular Cluster; M30;

    Sammanfattning : Globular Clusters contain very old metal-poor stars in different evolutionary stages evolved from the same primordial cloud. Signatures of atomic in stellar interiors are studied in the metal-poor GC M30. Furthermore, traces of cluster internal pollution depleting alpha elements e.g. LÄS MER

  4. 13. Implementing an Algorithm for Spectrum Extraction of Circumstellar Objects with High-Dispersion Spectroscopy

    Master-uppsats, Stockholms universitet/Institutionen för astronomi

    Författare :Marcus Karlsson; [2019]
    Nyckelord :Astronomy; Spectroscopy; Exoplanets; Circumstellar Objects; Direct Imaging;

    Sammanfattning : In this thesis project, we study the field of high-dispersion spectroscopy and methods for extracting the spectrum of circumstellar objects such as exoplanets from the combined signal of a stellar system. One of the only techniques for detecting absorption lines in exoplanetary atmospheres is to directly image a planet and record the reflected light. LÄS MER

  5. 14. Conditions for detecting population III galaxies with next-generation telescopes

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Emma Fransson; [2019]
    Nyckelord :population III stars galaxies WFIRST;

    Sammanfattning : Through the spectral synthesis model YGGDRASIL, developed by E. Zackris- son et al. 2011, luminosities for the chemically pristine population III galaxies are retrieved and compared to the capabilities of the upcoming infrared telescopes, in particluar the Wide Field InfraRed Survey Telescope (WFIRST). LÄS MER

  7. 15. Abundances of iron-peak elements in disk and bulge giant stars from high-resolution optical spectra

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Maria Lomaeva; [2018]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Context. The formation and evolution of the Galactic bulge and the Milky Way is still a debated subject. Observations of, e.g. LÄS MER