Sökning: "Galactic Centre"

Visar resultat 1 - 5 av 9 uppsatser innehållade orden Galactic Centre.

1. 1. The visibility of stellar transients in the Galactic Centre

   Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Astrofysik

   Författare :Jonathan Ström; [2024]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : A semi-analytical simulation was developed to evaluate the K-band magnitudes of Red Giants [0.96 - 1.02 M⊙] orbiting the supermassive black hole in the galactic centre. The model assumed star formation between 10-12 Gyrs ago and by following the IMF and applying a random age condition, a stellar population was created. LÄS MER

3. 2. Investigating a possible dearth of stars with zero angular momentum in the solar neighbourhood.

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Fysiska institutionen

   Författare :Aayush Desai; [2023]
   Nyckelord :Galaxy: disk; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Galaxy: nucleus; solar neighborhood; stars: kinematics and dynamics; Physics and Astronomy;

   Sammanfattning : Background. Carlberg & Innanen (1987) first proposed the idea of measuring the solar re- flex velocity (the velocity of the Sun around the galactic centre), Vg,⊙, using the momenta of the stars in the solar neighbourhood. The proposal was a consequence of the work of L. LÄS MER

4. 3. The Metallicity Structure of the Milky Way Halo II : Characterising the distant halo substructure

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Amanda Byström; [2022]
   Nyckelord :Milky Way; Galactic archaeology; halo; photometric metallicities; stellar catalogue; Gaia-Enceladus-Sausage; Sagittarius; Pristine survey; metallicity; Gaia mission;

   Sammanfattning : The Milky Way galaxy, like all spiral galaxies, is surrounded by a roughly spherical distribution of stars called the halo. The halo was largely formed when the galaxy merged with smaller galaxies. LÄS MER

5. 4. Stellar Encounters at the Galactic Centre

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Roberts Fisers; [2022]
   Nyckelord :Galaxy; encounter; SPH; NSC; Physics and Astronomy;

   Sammanfattning : Using methods of smoothed particle hydrodynamics (SPH) an N -body simulation was set-up to investigate stellar encounters between a 1 solar-mass main sequence (MS) star, modeled after the Sun, and a 0.6 solar-mass white dwarf (WD). This was done primarily to investigate the assumptions made by Mastrobuono-Battisti et al. LÄS MER

7. 5. Making Hypervelocity Stars

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Frans Forsberg; [2020]
   Nyckelord :Stellar Dynamics; Binary Stars; Galactic Centre; Binary Relaxation; Physics and Astronomy;

   Sammanfattning : In this thesis, I investigate if the binaries that are being tidally disrupted by means of the Hills mechanism, producing hypervelocity stars, could have been transported to the galactic centre by two-body scattering. To survive a scattering event, the binary must be hard, meaning that the binding energy of the binary is higher than the kinetic energy of the collider. LÄS MER