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Showing result 11 - 15 of 18 essays matching the above criteria.
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11. The Variability of the R Magnitude in Dynamical Models of AGB Stars
University essay from Uppsala universitet/Teoretisk astrofysikAbstract : This report will first give a brief background on asymptotic giant branch (AGB) stars and the characteristics that make them interesting to study. Some methods and tools used in the field are then introduced, before the photometric variability of these stars is investigated. READ MORE
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12. Examining variable galactic nuclei with the help of astronomical databases and archives
University essay from Uppsala universitet/Teoretisk astrofysikAbstract : There exists many astronomical objects that vary in brightness. Objects such as variable stars like the Cepheids that periodically expands and contracts their outer layers, or the active galactic nuclei (AGN) where accretion of matter into a black hole generates a often varying brightness. READ MORE
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13. The Relationship Between a Variable Orbital Eccentricity and Climate on an Earth-Like Planet
University essay from Uppsala universitet/Luft-, vatten- och landskapsläraAbstract : By using climate models based on the Earth’s climate, you can get information about how the climate on exoplanets can look like. ROCKE-3D is a general circulation model based on ModelE2, which is used for simulations of modern and prehistoric Earth’s climate. READ MORE
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14. Comparing the Period-Luminosityrelationships in variable stars
University essay from Uppsala universitet/Institutionen för fysik och astronomiAbstract : There are four Period Luminosity relations from three sources, [3, 5, 9, 11], that are compared for theiraccuracy in calculating distances and to see how much uncertainty has to be considered when calculatingother distances based on these. Here, the relations are compared by using each to calculate and compare thedistances of the stars: BK Vir, L2 Pup, R Hor, R Hya, R Lep, and RR Aql; along with using data from AAVSOand SIMBAD in the calculations. READ MORE
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15. Molecular gas around the binary star R Aquarii
University essay from Uppsala universitet/Institutionen för fysik och astronomiAbstract : At the end of the lives of low- to intermediate mass stars they can be found on the asymptotic giant branch (AGB). The AGB phase ends when the entire circumstellar envelope (CSE) is blown away in a superwindphase, in the end creating a planetary nebula. It is unknown what shapes the CSE and the planetary nebula. Binarity is a favored theory. READ MORE
