Browsing University of Missouri-Columbia by Thesis Advisor "Speck, Angela K."
Now showing items 1-9 of 9
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Carbon stars and silicon carbide
(University of Missouri--Columbia, 2010)Stars between about 0.8 and 8 times the mass of the Sun will eventually evolve become asymptotic giant branch (AGB) stars, where they pulsate and throw off mass from their atmospheres, forming dust shells in the space ... -
Dust formation and evolution around carbon stars
(University of Missouri--Columbia, 2018)Evolved intermediate-mass stars with carbon-to-oxygen ratios (C/O) above unity are known as carbon stars. Carbon stars are surrounded by dust shells dominated by carbon (C) and silicon carbide (SiC) grains. These SiC grains ... -
The effects of computer-supported inquiry-based learning methods and peer interaction on learning stellar parallax
(University of Missouri--Columbia, 2011)The presented study examined the effects of computer-supported inquiry-based learning and peer interaction methods on effectiveness of learning the stellar parallax concept and was conducted among 199 non-science major ... -
The enigmatic thirteen micron feature
(University of Missouri--Columbia, 2013)Low and intermediate mass stars (0.8--8 solar masses) will eventually evolve into Asymptotic Giant Branch (AGB) stars and pulsate out their atmosphere into the space around them. That ejected material will eventually cool ... -
Extremely extended dust shells around evolved intermediate mass stars: probing mass loss histories, thermal pulses and stellar evolution
(University of Missouri--Columbia, 2011)Intermediate mass stars ($0.8 - 8 solar masses), at the asymptotic giant branch phase (AGB) suffer intensive mass loss, which leads to the formation of a circumstellar shell (s) of gas and dust in their circumstellar ... -
Investigating the formation mechanism of polycyclic aromatic hydrocarbons and adapting particle swarm optimization techniques to search large data sets
(University of Missouri--Columbia, 2010)The unidentified infrared bands (UIBs) have been attributed to emission from polycyclic aromatic hydrocarbons (PAHs). The UIBs at 3.3 and 11.3 [mu]m, among others, are seen in many astrophysical environments, with the ... -
On the astromineralogy of the 13 [mu]m feature in the spectra of oxygen-rich AGB stars
(University of Missouri--Columbia, 2006)Approximately half the oxygen-rich AGB stars to be investigated spectroscopically exhibit a feature at 13 [mu]. The carrier of this feature has not yet been unequivocally identified, but has been attributed to various dust ... -
Small-scale structures in planetary nebulae
(University of Missouri--Columbia, 2017)Two planetary nebulae (PNe) were studied in order to investigate small scale molecular structures in planetary nebulae, the survival of which affects the structure and composition of the interstellar medium (ISM) from which ... -
Using infrared observations of circumstellar dust around evolved stars to test dust formation hypothesis
(University of Missouri--Columbia, 2011)Asymptotic Giant Branch (AGB) stars are evolved, low to intermediate mass (0.8-8M[circle dot operator}) stars. These stars lose a significant fraction of their mass through stellar pulsation. As a result, they are surrounded ...