Sökning: "stellar spectroscopy"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden stellar spectroscopy.

  1. 1. Mapping the present-day chemical abundance structure of the Solar neighbourhood: O & Si

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

    Författare :Kristiina Verro; [2017]
    Nyckelord :astrophysics; stellar spectroscopy; abundance analysis; solar neighbourhood; massive stars; Galaxy; Physics and Astronomy;

    Sammanfattning : Context. Large scale chemical abundance gradients in the Galactic disks, small-scale abundance structures, and the mean chemical abundance values in the Solar vicinity, are important constraints to Galactic chemo-dynamical formation and evolution models. LÄS MER

  2. 2. Investigating inner Galactic Bulge stars through the near infrared

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

    Författare :Hung Shuo Su; [2017]
    Nyckelord :Bulge; Milky Way; Galactic Centre; infrared; spectroscopy; Physics and Astronomy;

    Sammanfattning : Context: The formation of the Galactic Bulge is a topic of active research. There are many scenarios based on observations and Galactic evolution models. The key properties which need to be well constrained observationally are the metallicity distributions of stars and the spatial metallicity gradients. LÄS MER

  3. 3. The Galactic thick disk: a stellar population in its own right?

    Kandidat-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Vlad Rastau; [2017]
    Nyckelord :High resolution spectroscopy; stellar atmospheres; Galactic stellar populations;

    Sammanfattning : The Galactic disk is home of many billion stars, one of which isour Sun. The stellar population of which the Sun is a member residesin the vertically thin spiral structure of the disk. There is a seconddisk population, the so-called thick disk, that has somewhat dierentspatial, kinematic and chemical properties as compared to the thindisk. LÄS MER

  4. 4. Spatially resolved spectroscopy across HD 189733A using exoplanet transits

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

    Författare :Martin Gustavsson; [2017]
    Nyckelord :stellar atmospheres; solar-type stars; stellar spectroscopy; line profiles; exoplanets; Physics and Astronomy;

    Sammanfattning : For testing three-dimensional (3D) hydrodynamic models of stellar atmospheres, spectroscopy across spatially resolved stellar surfaces with high spectral resolution is desired. 3D models predict center-to-limb changes in asymmetries, shapes, strengths and wavelength positions of spectral line profiles, reflecting the hydrodynamics of the stellar atmosphere. LÄS MER

  5. 5. Hyperfine structure measurements in scandium for IR spectroscopy

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

    Författare :Felix van Deelen; [2017]
    Nyckelord :Astrophysics; Atomic Data; Hyperfine Structure; Stellar Spectroscopy; Physics and Astronomy;

    Sammanfattning : Stellar abundances are important for understanding the chemical evolution of galaxies and provide us with constraints on stellar evolution and supernova nucleosynthesis. To determine stellar abundances accurately, atomic data is crucial. This data is incomplete for many elements, especially in the infrared region. LÄS MER

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