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Found 5 essays matching the above criteria.

  1. 1. Isochrone and chemical ages of stars in the old open cluster M67

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Julia Ahlvind; [2021]
    Keywords : solar twin; Messier 67; M67; open cluster; isochrone; chemical clock;

    Abstract : The open cluster Messier 67 is known to have chemical composition, metallicity and age (~ 4 Gyr) close to the Sun. Therefore, it is advantageous for stellar physical studies and of stellar evolution, in particular for solar like stars within the cluster. READ MORE

  3. 2. Planet Engulfment: Do Stars Eat Their Own Children?

    University essay from Uppsala universitet/Teoretisk astrofysik

    Author : Toivo Tuma Niemi; [2019]
    Keywords : Planet Engulfment; Solar Twin; Planet; Star; Planetslukning; Soltvilling; Planet; Stjärna;

    Abstract : Some stars with similar properties to our sun (solar twins) have differ- ent chemical composition than the rest of the solar twins. One explanation might be planet engulfment. Therefore we did a large number of simu- lations where a disturbing star passed a sun and a planet at a distance closer than 100 AU to see how often the planet was engulfed. READ MORE

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

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation

    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. 4. Chemical composition of giant planet hosts

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation

    Author : Frida Ekstrand; [2017]
    Keywords : chemical composition; planet hosts; stellar twins; differential abundance analysis; Physics and Astronomy;

    Abstract : Does the formation of planets give imprints on the chemical composition of the host star? In order to test this theory a differential abundance analysis (i.e. comparing two stars' abundances to each other) was carried out on a few stars with and without known planets, to see if any differences were found. READ MORE

  6. 5. Chemical abundances in main-sequence stars in open cluster M67

    University essay from Teoretisk astrofysik

    Author : Nemo van den Brink; [2011]
    Keywords : Chemical abundance; Diffusion; Solar Twin; M67; Spectroscopy;

    Abstract : The discovery of a solar twin in the open star cluster M67 (Önehag et al. 2011) implies a near-solar chemical composition for the cluster. READ MORE