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    Probing the chemical environments of early star formation : a multidisciplinary approach

    Author
    Hardegree-Ullman, Emily Elizabeth
    View/Open
    172724_HardegreeUllman_rpi_0185E_10308.pdf (10.63Mb)
    Other Contributors
    Whittet, D. C. B. (Doug C. B.); Newberg, Heidi; Roberge, W. G. (Wayne G.); Swindle, Timothy D.; Watson, E. Bruce;
    Date Issued
    2014-05
    Subject
    Multidisciplinary science
    Degree
    PhD;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/1127
    Abstract
    Chemical compositions of prestellar and protostellar environments in the dense interstellar medium are best quantified using a multidisciplinary approach. For my dissertation, I completed two projects to measure molecular abundances during the earliest phases of star formation. The first project investigates gas phase CO depletion in molecular cloud cores, the progenitors of star systems, using infrared photometry and molecular line spectroscopy at radio wavelengths. Hydrogenation of CO depleted onto dust is an important first step toward building complex organic molecules. The second project constrains polycyclic aromatic hydrocarbon (PAH) abundances toward young stellar objects (YSO). Band strengths measured from laboratory spectroscopy of pyrene/water ice mixtures were applied to estimate abundances from features attributed to PAHs in observational YSO spectra. PAHs represent a distinct but important component of interstellar organic material that is widely observed but not well quantified in star-forming regions.;
    Description
    May 2014; School of Science
    Department
    Multidisciplinary Science Program;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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    • RPI Theses Online (Complete)

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