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Small-scale structures in planetary nebulae
(University of Missouri--Columbia, 2017)
of stars is born. Molecular hydrogen (H[subscript 2]) was used a tracer for molecular emission and its excitation properties used as a probe of shock physics. Previous studies of several planetary nebulae have indicated a relationship between molecular...
Extremely extended dust shells around evolved intermediate mass stars: probing mass loss histories, thermal pulses and stellar evolution
(University of Missouri--Columbia, 2011)
) images, are used to study the physical properties and the material distribution of dust shells of AGB and post AGB circumstellar envelope. Infrared radiation from thermal dust emission can be used to probe the entire dust shell because, near to mid...
Using infrared observations of circumstellar dust around evolved stars to test dust formation hypothesis
(University of Missouri--Columbia, 2011)
pulsate; and spatially as dust flows away from the star and physical conditions change. My research on the temporal variation of the spectral dust features with pulsation cycle for single, O-rich Mira variable, T Cep, suggests that its spectral features...
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 ...
The effects of computer-supported inquiry-based learning methods and peer interaction on learning stellar parallax
(University of Missouri--Columbia, 2011)
in an introductory astronomy course at the University of Missouri. A computer-based tutorial Stellar Parallax Interactive Restricted and Unrestricted Tutorial (SPIRUT) was developed for this investigation. Results of the study revealed that students who learned...
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 ...
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 ...
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 ...
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 ...