Essays about: "stars: M67"

Found 5 essays containing the words stars: M67.

  1. 1. Blue Stragglers from Primordial Binary Evolution

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation

    Author : Emilie Desrochers Karlsson; [2022]
    Keywords : blue stragglers; binary; stars; binary evolution; mass transfer; Physics and Astronomy;

    Abstract : Blue stragglers were first discovered as hotter and more luminous than the turnoff in the globular cluster M3. Their presence is typically explained by the interplay between stellar collisions and mass transfer in binary systems. In this thesis, I study blue stragglers produced from primordial binary evolution. READ MORE

  3. 2. Spectroscopic determination of stellar parameters to constrain atomic diffusion in the old open cluster M67

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Fabian Lundell; [2022]
    Keywords : ;

    Abstract : In an attempt to check published results on diffusion effects in M67 a non-LTE analysis is made on 28 high resolution FLAMES-UVES spectra of dwarfs and sub-giants around the turnoff point, where core hydrogen fusion halts. This analysis utilizes the software-suites LOTUS and iSpec to determine stellar parameters from equivalent-width measurements. READ MORE

  4. 3. 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

  5. 4. 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

  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