Academic literature on the topic 'Astrophysics and Space Science'

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Dissertations / Theses on the topic "Astrophysics and Space Science"

1

Bonokwane, Kelebogile. "SALT and TESS monitoring of central stars of planetary nebulae." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33436.

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Planetary Nebulae (PNe) are the product of Asymptotic Giant Branch (AGB) evolution. Evolved from Solar-like intermediate mass stars (0.8 – 8M), they have a hot, radiating core that ionizes the gas of the expelled envelope, producing a glowing nebula. The core eventually evolves into a white dwarf (WD), following the WD cooling track. Complex, aspherical morphologies are observed in PNe and binary central stars (CSs) have been the favoured explanation for deviations from spherical symmetry. Finding and characterizing the population of binary CSs is thus important to understand the physics behin
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Oreta, Timothy. "Vector-Galileon-Tensor theories of gravity." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20925.

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A detailed study of the cosmological evolution in a particular vector-tensor theory of gravity with a potential and a Galileon-motivated interaction terms is presented. The evolution of vector field self interactions that are relatively related to Galileon fields throughout the expansion history of the universe is considered and a classification of the parameters M (mass term) and H (Hubble parameter) according to the behaviour of the field in each cosmological epoch is carried out. In particular, we obtain conditions for the parameters so that the field grows exponentially or oscillates with
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Misra, Anuj. "Towards a holographic description of pulsar glitch mechanism." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15589.

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This work aims to review the progress in understanding the underlining physics of pulsar glitches: beginning from the pedagogical development of the subject to eventually motivating the use of AdS/CFT techniques in studying a certain class of condensed matter systems. The foundation of this work is built upon the Gross Pitaevskii (GP) model of super-fluidity applied to the interior matter of neutron stars, where the condensate wave function acts as the order parameter of the macroscopic coherence theory. The excitation modes of the field equations are found to be solitonic vortices, which then
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Kubwimana, Jean Claude. "Cosmic acceleration and the coincidence problem." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/6102.

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Includes abstract.<br>Includes bibliographical references (leaves 83-89).<br>In the standard model of the Universe, the cosmos has only accelerated once since decoupling and only recently, at around a redshift of z ̃ 0.5 as supported by different observations including Type Ia Supernovae (SNIa), the Cosmic Microwave Background (CMB), Large Scale Structure (LSS), and Weak Lensing (WL). This confirmation however, lacks a fundamental physics explanation. The hypothetical form of energy termed 'dark energy' (DE) assumed to account for that acceleration behavior, is still mysterious and why its dom
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Obonyo, Willice Odhiambo. "Open clusters and HII regions of our Galaxy." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/19997.

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Open clusters are essential laboratories for understanding stellar evolution, as they allow constraints to be placed on stellar ages and luminosities. As distance indicators they are also important tracers of star formation in the Milky Way. One such cluster is Trumpler 27 that we identified for detailed study.The aim of the study is to estimate the distance, radial velocity, age, membership and reddening of the cluster using both spectroscopic and photometric techniques. We used new spectroscopic data collected from SAAO's 1.9m telescope together with existing photometric data from catalogues
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Tapsoba, Wendyam Blaise. "Analysis of SALT Fabry-Pérot medium resolution data." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/16494.

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The Southern African Large Telescope Fabry-Pérot interferometer has been used in its medium resolution mode to observe three of 30 galaxies of the MHONGOOSE galaxy sample for which very deep HI observation (typically 200 hours/galaxy) will be obtained with MeerKAT. So optical high spatial resolution of 2 arcsec data of NGC 7361, NGC 7424 and NGC 7793 have been obtained. The major object of this thesis was to test SALT Fabry-Pérot medium resolution data in order to pursue the survey of all the MHONGOOSE sample, and to be able to compare the accuracy of the kinematic results. Through this work,
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Tshenye, Thapelo Obed. "Quality control of astronomical CCD observations." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/4409.

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Okouma, Patrice M. "Type Ia supernovae as tools for cosmology." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/4424.

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Sikhonde, Muzikayise E. "A study of chameleon-photon mixing from pulsars." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/12638.

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Includes bibliographical references.<br>A number of solutions to the dark energy problem have been proposed in literature, the simplest is the cosmological constant A. The cosmological constant lacks theoretical explanation for its extremely small value, thus dark energy is more generally modelled as a quintessence scalar field rolling down a flat potential.
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Affadi, Ikechukwu Patrick. "A new method of mapping cosmic flow fields : evaluating the sustainability of the infrared bands Tully-Fisher relation for ZoA work." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20813.

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This thesis aims at using the Infrared Survey Facility (IRSF) JHKₛ bands, Two Micron All Sky Survey (2MASS) JHKₛ bands and Wide Field Infrared Survey Explorer (WISE) W1-W4 bands isophotal magnitudes to understand the cosmic flow associated with Zone of Avoidance (ZoA) galaxies.
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