Sökning: "Julia Ahlvind"

Hittade 3 uppsatser innehållade orden Julia Ahlvind.

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

   Master-uppsats, Uppsala universitet/Observationell astrofysik

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

   Sammanfattning : 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. LÄS MER

3. 2. Isochrone and chemical ages of stars in the old open cluster M67

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Julia Ahlvind; [2021]
   Nyckelord :solar twin; Messier 67; M67; open cluster; isochrone; chemical clock;

   Sammanfattning : The open cluster Messier 67 is known to have chemical composition, metallicity and age (~ 4 Gyr) close to the Sun. Therefore, it is advantageous for stellar physical studies and of stellar evolution, in particular for solar like stars within the cluster. LÄS MER

4. 3. The Almighty Quasar — Destroyer of Worlds

   Kandidat-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Julia Ahlvind; [2019]
   Nyckelord :Astronomy; Habitability; Quasars; Active galactic nucleus; AGN;

   Sammanfattning : In the study of habitability of terrestrial exoplanets, both life-supporting conditions and the prevalence of transient life-threatening events need to be considered. One type of hazardous effect that has so far not received much attention is the thermal effect of a nearby active galactic nucleus (AGN), or in this particular case, the class of the AGN known as a quasar. LÄS MER