Essays about: "stars: chemically peculiar"

Found 5 essays containing the words stars: chemically peculiar.

  1. 1. Magnetic field of the Ap star EP UMa

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Jakob Melin; [2023]
    Keywords : stars: chemically peculiar - stars: magnetic fields – stars: individual: EP UMa;

    Abstract : Magnetic fields play a crucial roll in the stellar activity and evolutionof stars. Despite much research there is much that we do notunderstand. Among Ap stars, empirical evidence has suggested a minimumthreshold for the dipolar magnetic field strength of Bp ≈ 300G. READ MORE

  3. 2. The magnetic field of phi Draconis

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Nikolaos Papakonstantinou; [2022]
    Keywords : stars: atmospheres – stars: chemically peculiar – stars: magnetic field – stars: starspots – stars: individual: phi Dra;

    Abstract : Within this past decade, advances in spectropolarimetric analyses allowed mapping surface characteristics of nearby non-resolved stars with unique characteristics. In this study, we attempt mapping of the magnetic field structure and surface distribution of elements for such a star, the magnetic Ap star phi Dra. READ MORE

  4. 3. Magnetic field strength of chemically peculiar A and B-type stars

    University essay from Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen

    Author : Majid Husseini; [2021]
    Keywords : ;

    Abstract : The goal of this work is to detect Zeeman split lines and measure magnetic field strength in a sample of Ap stars. This work aims to analyse spectra of 454 stars and find stars that show spectral lines resolved into their magnetically split components. READ MORE

  5. 4. Investigation of variable Ap Stars in TESS continuous viewing zone

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Nikolaos Papakonstantinou; [2021]
    Keywords : stars: chemically peculiar; stars: magnetic fields; stars: variables; techniques: photometric; stars: early-type; stars: magnetic fields; stars: rotation;

    Abstract : .... READ MORE

  6. 5. Formation of Eu II spectral features in magnetic chemically peculiar stars

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Luca Schmidt; [2020]
    Keywords : ;

    Abstract : The advancing resolution of modern spectrometers uncovers increasingly detailed spectral features in astrophysical observations which can be attributed to properties of the energy structure of the corresponding atomic systems such as fine, hyperfine and Zeeman splitting. At the same time, increasing computational power enables us to include these quantum mechanical interactions on different levels of sophistication in our theoretical atomic structure calculations. READ MORE