Sökning: "Nikolaos Papakonstantinou"

Hittade 3 uppsatser innehållade orden Nikolaos Papakonstantinou.

1. 1. The magnetic field of phi Draconis

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Nikolaos Papakonstantinou; [2022]
   Nyckelord :stars: atmospheres – stars: chemically peculiar – stars: magnetic field – stars: starspots – stars: individual: phi Dra;

   Sammanfattning : Within this past decade, advances in spectropolarimetric analyses allowed mapping surface characteristics of nearby non-resolved stars with unique characteristics. In this study, we attempt mapping of the magnetic field structure and surface distribution of elements for such a star, the magnetic Ap star phi Dra. LÄS MER

3. 2. Investigation of variable Ap Stars in TESS continuous viewing zone

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Nikolaos Papakonstantinou; [2021]
   Nyckelord :stars: chemically peculiar; stars: magnetic fields; stars: variables; techniques: photometric; stars: early-type; stars: magnetic fields; stars: rotation;

   Sammanfattning : .... LÄS MER

4. 3. Examining LUMBA UVES pipeline spectroscopy on giant and sub-giant stars of M67

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Nikolaos Papakonstantinou; [2021]
   Nyckelord :methods: numerical; stars:abundances; stars: atmospheres; stars: statistics; stars:giants; stars:subgiants; stars: open clusters; stars: M67;

   Sammanfattning : In this work, the efficiency of the LUMBA UVES pipeline for processing of spectroscopic observations is tested by use on 23 high-resolution spectra of the open star cluster M67. An abundance trend discovered by Gavel et al. (2019) concerning iron abundances of giant and sub-giant stars of that cluster is examined. LÄS MER