Essays about: "stars: statistics"

Showing result 1 - 5 of 6 essays containing the words stars: statistics.

  1. 1. Colliding Galaxies in a (Nut)Shell

    University essay from Lunds universitet/Astronomi

    Author : Jonathan Petersson; [2022]
    Keywords : shell galaxies; simulations; starbursts; quenching; mergers; Physics and Astronomy;

    Abstract : Galaxy interactions and mergers are natural recurring events in the current cosmological paradigm, events that often coincide with starbursts and enhanced star formation activity. To understand why that is, one can use idealised (non-cosmological) merger simulations, which provide freedom to recreate specific tidally distorted galaxies, and analysis of the time evolution and underlying physics of the star formation activity at a high spatial resolution. READ MORE

  2. 2. Examining LUMBA UVES pipeline spectroscopy on giant and sub-giant stars of M67

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Nikolaos Papakonstantinou; [2021]
    Keywords : methods: numerical; stars:abundances; stars: atmospheres; stars: statistics; stars:giants; stars:subgiants; stars: open clusters; stars: M67;

    Abstract : In this work, the efficiency of the LUMBA UVES pipeline for processing of spectroscopic observations is tested by use on 23 high-resolution spectra of the open star cluster M67. An abundance trend discovered by Gavel et al. (2019) concerning iron abundances of giant and sub-giant stars of that cluster is examined. READ MORE

  3. 3. An introduction to some ordinary differential equations governing stellar structures

    University essay from Lunds universitet/Matematik (naturvetenskapliga fakulteten)

    Author : Yani di Giovanni; [2019]
    Keywords : Mathematics and Statistics;

    Abstract : The Lane-Emden equation is a non-linear differential equation governing the equilibrium of polytropic stationary self-gravitating, spherically symmetric star models; $${\frac {1}{\xi ^{2}}}{\frac {d}{d\xi }}\left({\xi ^{2}{\frac {d\theta }{d\xi }}}\right)+\theta ^{n}=0.$$ In the isothermal cases we have the Chandrasekhar equation: $${\frac {1}{\xi ^{2}}}{\frac {d}{d\xi }}\left({\xi ^{2}{\frac {d\psi}{d\xi }}}\right)-e^{-\psi}=0$$ After having derived these models, we will go through all cases for which analytic solutions are achievable. READ MORE

  4. 4. Detailed analysis of the chemical composition of stars harboring Earth-like planets

    University essay from Lunds universitet/Astronomi

    Author : Lorena Acuña Aguirre; [2019]
    Keywords : Physics and Astronomy;

    Abstract : Context. The planet-metallicity correlation for gaseous giants is widely accepted through spectroscopic studies. However, whether a similar correlation exists for terrestrial planets is a debated subject. READ MORE

  5. 5. Procedurally Generating an Artificial Galaxy

    University essay from Lunds universitet/Statistiska institutionen

    Author : Olof Elfwering; [2016]
    Keywords : Mathematics and Statistics;

    Abstract : The idea of procedurally generating artificial worlds has been around for a long time. It is used both for CGI effects in movies and, more prominently, for video games. It is done by big companies and small teams; professionals as well as beginners and hobbyists. READ MORE