Essays about: "Stellar Temperature"

Showing result 21 - 25 of 29 essays containing the words Stellar Temperature.

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

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

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

    Abstract : 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. READ MORE

  3. 22. 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

  4. 23. Determining the effective temperature of cool stars from near-infrared spectra

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

    Author : Henrik Rhodin; [2015]
    Keywords : Physics and Astronomy;

    Abstract : Context. Effective temperature is one of the fundamental stellar parameters. A traditional spectroscopic way to determine it is from optical spectra using excitation balance of Fe-lines. READ MORE

  5. 24. Migrating Dust Particles

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

    Author : Joakim Eriksson; [2014]
    Keywords : Physics and Astronomy;

    Abstract : Where the dust in a protoplanetary disk is as the disk evolves over time is essential to know for further studies of the planet formation process. A new star is created alongside a stellar nebula. The nebula contains rock, ice and gas which are not accreted to the star. READ MORE

  6. 25. Ranking line-depth ratios for determining relative star temperatures in dwarfs

    University essay from Observationell astrofysik

    Author : Louise Edstam; [2013]
    Keywords : line-depth ratio; effective star temperature; ranking; dwarfs;

    Abstract : The central line-depths of absorption lines depend upon stellar temperature. By dividing the central line-depth of such a line with a central line-depth independent of temperature, a thermometer of relative star temperatures is obtained in the form of a line-depth ratio (LDR), once it is related to an effective temperature scale. READ MORE