• AGB stars in the early universe I: Towards a portable chemical and thermal evolution model 

    Liao, Andy Sha (2012-05-04)
    Stars in the asymptotic giant branch (AGB) are in the penultimate stage of their lives as low- mass dwarfs. During this stage, they produce in their cool, bloated envelopes vast quantities of dust composed from metals ...
  • Contributions to absorption line weakening in the Earth's atmosphere 

    Penner, Kyle; Allende Prieto, Carlos (2011-09-01)
    Daytime skylight is an imperfect representation of the solar spectrum. Scattering of light in the Earth’s atmosphere changes the depths of solar absorption lines. This scattering is due to either molecules or dust grains ...
  • Convection in white dwarf stars 

    Luecke, Kevin J.P. (2013-08-19)
    White dwarfs are some of the simplest stars. Because of their simplicity, they can be studied to learn fundamental facts about the universe. By studying them, we can learn about their progenitors, and 97% of stars end their ...
  • The impact of x-rays on primordial minihalos 

    Oliveri, Anthony (2014-04-25)
    One of the current problems in cosmology is to understand how the first gravitationally- bound objects, or dark matter minihalos, evolved to form chemically rich, star-forming galaxies. The first stars to exist are believed ...
  • Improved yttrium and zirconium abundances in metal-poor stars 

    Violante, Renata (2012-04-30)
    We present new abundances of the lighter n-capture elements, Yttrium (Z=30) and Zirconium (Z=40) in the very metal-poor, r-process rich stars BD+17 3248 and HD 221170. Very accurate abundances were obtained by use of the ...
  • Signal-to-noise cutoffs for simulations in the data analysis system for HETDEX 

    Allen, Aditi R. (2012-05-22)
    The universe we live in is continually expanding, and we have known for almost 15 years that the expansion rate is actually increasing. The source of this acceleration was termed ”Dark Energy” by astronomers, and it is ...
  • Spectral Energy Distributions and Optical Data Analysis of the TANAMI Sources 

    Stein, Miquela (2015-05-06)
    The TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Inter- ferometry) survey is a multi-wavelength study of 89 active galactic nuclei (AGN) seen in the southern hemisphere sky. This project uses ...