Sökning: "APOGEE"

Visar resultat 1 - 5 av 11 uppsatser innehållade ordet APOGEE.

  1. 1. The chemical evolution of the Milky Way: pushing APOGEE to higher precision and accuracy

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

    Författare :Erik Fridén; [2023]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : In the recent decade, a rapid increase in all-sky spectroscopic surveys has occurred, and with it, the wealth of observational data and information on our Galaxy. Consequently, numerous detections of new structures, such as new open clusters, accreted and in-situ components, are discovered. LÄS MER

  3. 2. Origin of blue straggler stars in the Milky Way halo

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

    Författare :Adam Brcek; [2023]
    Nyckelord :Blue Straggler; Galactic Halo; Spectroscopic Surveys; Binary Star Evolution; Mass Transfer; Physics and Astronomy;

    Sammanfattning : Blue straggler stars (BSSs) are exotic stellar objects that appear to be younger than the age of the population they come from suggests. They are observed as the extension of the main sequence stars, beyond the turn-off point. LÄS MER

  4. 3. Development and testing of algorithms for optimal thruster command distribution during MTG orbital manoeuvres

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Lars Sprengelmeyer; [2020]
    Nyckelord :linear programming algorithms; linear optimization; thruster command distribution; thruster control; Simplex; Karmarkar s method; minimum power controller; minimum flow rate controller; minimum control authority;

    Sammanfattning : An accurate satellite attitude and orbit control is a key factor for a successful mission. It guarantees for example sun acquisition on solar panels, fine pointing for optimal telescope usage or satellite lifting to reach higher orbits, when required. LÄS MER

  5. 4. Accurate Abundances of Giant Stars in the Local disk: A manual analysis of IR APOGEE spectra

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Ivalu Barlach Christensen; [2020]
    Nyckelord :Galactic Chemical Evolution; Astrophysics; Astronomy; IR Spectroscopy; Milky Way; Abundance; Physics and Astronomy;

    Sammanfattning : Purpose: In order to study the Galactic Chemical Evolution, elemental abundances are needed. The purpose of this work is to investigate the chemical evolution of the Milky Way by determining several elemental abundances of giants in the local disk. LÄS MER

  7. 5. From the bulge region to the outer disk: Tracing the α-enhancement level in the Galactic thin and thick disks

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Elin Sandvik; [2020]
    Nyckelord :Chemical abundance; star formation rate; initial-mass function; APOGEE; Milky Way; Physics and Astronomy;

    Sammanfattning : One of the biggest mysteries astronomers wish to unveil is the formation and evolution of galaxies. Properties of our own galaxy, the Milky Way, can provide great insight into these. The star formation rate (SFR) and whether it varies with distance from the galactic centre (GC), is one of these properties. LÄS MER