Essays about: "stellar catalogue"

Showing result 1 - 5 of 14 essays containing the words stellar catalogue.

  1. 1. The quest for a classical bulge - a study of kinematics, abundances, and ages using microlensed dwarf stars and Gaia

    University essay from Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Author : Calum Kvernes Macpherson; [2023]
    Keywords : Bulge; Milky Way; Kinematics; Galpy; Dwarf Stars; Physics and Astronomy;

    Abstract : Context: We present an kinematical analysis of 90 F and G type dwarf, turn-off, and subgiant stars in the Galactic bulge. These stars were observed with high-resolution spectrographs during gravitational microlensing events This allowed for their ages, abundances, and radial velocities to be ascertained while they were significantly brighter. READ MORE

  3. 2. Combining Hipparcos and Gaia data: Improved Astrometric Calculations With Orvara

    University essay from Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Author : Melvin Tham; [2023]
    Keywords : Astrometry; Af Leporis; Smethells 119; Gliese 105; Gliese 86; Orvara; Hipparcos; Gaia; Physics and Astronomy;

    Abstract : Hipparcos and Gaia are two missions intended to catalogue positions and motions of stellar objects. Orvara is a computer program which aims to combine the data from these two missions to calculate Keplerian parameters for stellar systems. READ MORE

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

    University essay from Uppsala universitet/Observationell astrofysik

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

    Abstract : 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. READ MORE

  5. 4. Magnificent beasts of the Milky Way: Hunting down stars with unusual infrared properties using supervised machine learning

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Julia Ahlvind; [2021]
    Keywords : machine learning; supervised machine learning; support vector machine; photometry; stars; stellar physics; astronomical archives;

    Abstract : The significant increase of astronomical data necessitates new strategies and developments to analyse a large amount of information, which no longer is efficient if done by hand. Supervised machine learning is an example of one such modern strategy. READ MORE

  6. 5. The Metallicity Structure of the Milky Way halo I : Creating a stellar catalogue of the distant halo’s red giants

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Amanda Byström; [2021]
    Keywords : Milky Way; Galactic archaeology; halo; photometric metallicities; stellar catalogue; giant stars; distance calculations; Pristine survey; Gaia mission; metallicity distribution;

    Abstract : The Milky Way's halo is an approximately spherical distribution of stars surrounding the Galaxy that carries the history of the Milky Way. The outer halo is a Galactic region with long dynamical timescales largely built up by accreted material. READ MORE