Essays about: "Spectroscopy and stars"

Showing result 21 - 25 of 32 essays containing the words Spectroscopy and stars.

  1. 21. Investigating inner Galactic Bulge stars through the near infrared

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

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

    Abstract : 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. READ MORE

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

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Vlad Rastau; [2017]
    Keywords : High resolution spectroscopy; stellar atmospheres; Galactic stellar populations;

    Abstract : 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. READ MORE

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

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

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

    Abstract : 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. READ MORE

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

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

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

    Abstract : 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. READ MORE

  6. 25. Identification of elements and molecules in the spectra of an M dwarf star using high resolution infrared spectroscopy.

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Markus Pudas; [2017]
    Keywords : M dwarf stars; line list ; spectroscopy ; high resolution infrared; telluric spectra;

    Abstract : M dwarfs are abundant and long-lived stellar objects. The formation of planets around stars in stellar systems is believed to be metallicity dependent. To determine the metallicity with synthetic spectrum analysis, the elements producing the absorption lines ofthe spectra first have to be identified. READ MORE