Sökning: "stjärnatmosfär"

Hittade 2 uppsatser innehållade ordet stjärnatmosfär.

1. 1. Broadening of spectral lines in the Gaia-ESO survey

   Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

   Författare :Kristoffer Bengtsson; [2018]
   Nyckelord :Astronomy; Hydrogen; Iron; Spectral line broadening; collisional broadening; pressure broadening; Gaia; Stellar atmosphere; spectrum; stars: abundances; Atomic data; Astronomi; tryckbreddning; kollisionsbreddning; breddning av spektrallinjer; spektrum; väte; järn; Gaia; stjärnatmosfär; atomdata;

   Sammanfattning : Analyzing stellar spectra plays a big role in understanding the evolution of our galaxy. Having good data for spectral line properties is very important when analyzing these spectra. One part of the Gaia-ESO public spectroscopic survey (GES) is to gather data for spectral line properties from stellar spectra. LÄS MER

3. 2. Spatially resolved spectroscopy across HD 189733A using exoplanet transits

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

   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