Sökning: "Solar Twin"
Visar resultat 1 - 5 av 8 uppsatser innehållade orden Solar Twin.
1. Isochrone and chemical ages of stars in the old open cluster M67
Master-uppsats, Uppsala universitet/Observationell astrofysikSammanfattning : 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
2. High resolution imaging observations of exoplanet host stars
Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisationSammanfattning : This is a thesis project, analysing data from high-resolution imaging observations, specifically speckle imaging, as a follow up study of exoplanet host stars observed with K2, the second operational phase of the space telescope Kepler. The project was accomplished at NASA Ames research center under the guidance of Rachel A. LÄS MER
3. Planet Engulfment: Do Stars Eat Their Own Children?
Kandidat-uppsats, Uppsala universitet/Teoretisk astrofysikSammanfattning : Some stars with similar properties to our sun (solar twins) have differ- ent chemical composition than the rest of the solar twins. One explanation might be planet engulfment. Therefore we did a large number of simu- lations where a disturbing star passed a sun and a planet at a distance closer than 100 AU to see how often the planet was engulfed. LÄS MER
4. Chemical composition of giant planet hosts
Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisationSammanfattning : Does the formation of planets give imprints on the chemical composition of the host star? In order to test this theory a differential abundance analysis (i.e. comparing two stars' abundances to each other) was carried out on a few stars with and without known planets, to see if any differences were found. LÄS MER
5. A differential spectroscopic study of a faint solar twin in the open cluster M67
Kandidat-uppsats, Uppsala universitet/Observationell astrofysikSammanfattning : A solar twin is a star with characteristics very similar to those of the Sun. This is, a Sun-like star. Earlier studies show that M67-1194 is one of the best solar twins found to date. But this star is not exactly like the Sun. LÄS MER