Sökning: "stellar parameters"
Visar resultat 16 - 20 av 58 uppsatser innehållade orden stellar parameters.
16. Stellar Encounters at the Galactic Centre
Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisationSammanfattning : Using methods of smoothed particle hydrodynamics (SPH) an N -body simulation was set-up to investigate stellar encounters between a 1 solar-mass main sequence (MS) star, modeled after the Sun, and a 0.6 solar-mass white dwarf (WD). This was done primarily to investigate the assumptions made by Mastrobuono-Battisti et al. LÄS MER
17. Exploring the Diversity of Exoplanets
Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknikSammanfattning : The search for extrasolar planets had been ongoing for many years when Mayorand Queloz discovered 51 Pegasi b in 1995. It was a giant gas planet similar to Jupiter, but with a larger radius and of only half of Jupiter’s mass. Theso called Hot Jupiter was observed to orbit its host star 7 times closer thanMercury is orbiting the Sun. LÄS MER
18. Markov Chain Monte Carlo (MCMC) and Bayesian Inference for Gravitational Waves
Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisationSammanfattning : The Laser Interferometer Space Antenna (LISA) is a space borne gravitational wave detec- tor set to launch in 2034, with the objective of detecting and studying the Gravitational Waves (GWs) of our universe. So far, ground-based detectors such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) have been successful in detecting GWs, but the limitations of ground based detectors is what makes LISA so special. LÄS MER
19. An Infrared Stellar Thermometer
Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisationSammanfattning : Infrared (IR) spectroscopy has many advantages over optical, one of which is allowing us to see through intergalactic dust, letting us probe deeper into space and dust-dense regions such as galactic centers. However the investigating the IR spectral range is a relatively new field, owing to recent developments in detector technology, and stellar parameter determination in IR is not well researched. LÄS MER
20. Machine Learning for Stellar Spectra : Anomaly Detection in stellar spectra using Unsupervised Random ForestSpectral Analysis using Variational Autoencoders
Master-uppsats, Luleå tekniska universitet/RymdteknikSammanfattning : This thesis was carried out in two parts. The stellar spectral data was used from the Gaia-ESO survey. The data used was fromthe public archive as well as data received from Dr. Recio-Blanco at Observatoire Cote D'Azure. LÄS MER