Sökning: "stellar convection"

Hittade 4 uppsatser innehållade orden stellar convection.

  1. 1. Measuring the Characteristic Sizes of Convection Structures in AGB Stars with Fourier Decomposition Analyses : the Stellar Intensity Analyzer (SIA) Pipeline.

    Master-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Miquel Colom i Bernadich; [2020]
    Nyckelord :Asymptotic Giant Branch; AGB; red giants; stars; stellar convection; Fourier analysis; convection cells;

    Sammanfattning : Context. Theoretical studies predict that the length scale of convection in stellar atmospheres isproportional to the pressure scale height, which implies that giant and supergiant stars should have convection granules of sizes comparable to their radii. LÄS MER

  3. 2. Spectroscopy of the Globular Cluster M30

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Kilian Hikaru Scheutwinkel; [2019]
    Nyckelord :Spectroscopy; Globular Cluster; M30;

    Sammanfattning : Globular Clusters contain very old metal-poor stars in different evolutionary stages evolved from the same primordial cloud. Signatures of atomic in stellar interiors are studied in the metal-poor GC M30. Furthermore, traces of cluster internal pollution depleting alpha elements e.g. LÄS MER

  4. 3. Searching for Exoplanets in K2 Data

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Iskra Georgieva; [2018]
    Nyckelord :exoplanets; transit method;

    Sammanfattning : The field of extrasolar planets is undoubtedly one of the most exciting and fast-moving in astronomy. Thanks to the Kepler Space Telescope, which has given us the Kepler and K2 missions, we now have thousands of planets to study and thousands more candidates waiting to be confirmed. LÄS MER

  5. 4. Spectral investigation of the globular cluster M30

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Scheutwinkel Kilian Hikaru; [2018]
    Nyckelord :M30; globular cluster; spectroscopy;

    Sammanfattning : Globular cluster studies suggest that a signature in the spectra of RGB stars in a globular cluster are anti-correlations in Mg-Al and Na-O. In this work, a small sample of 12 RGB stars of the globular cluster M30 is investigated using VLT-UVES high-resolution spectrograph. LÄS MER