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    The Nature and Origin of Molecular Knots in Planetary Nebulae

    Eyermann, S. E.
    Speck, Angela K.
    Meixner, Margaret
    McCullough, Peter
    Hora, J.
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    [PDF] Article (375.5Kb)
    Date
    2005
    Format
    Article
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    Abstract
    Planetary Nebulae (PNe) are major contributors to the enrichment of the interstellar medium (ISM). Knots and filaments in the ionized gas images of PNe are common, if not ubiquitous. Additionally, it has been shown that molecular gas exists inside dense condensations within the ionized regions. The origins of these clumps are not known, though the suggested formation mechanisms fall into two main scenarios: (1) they form during the AGB phase; (2) they form as a result of the onset of the PN phase as the fast wind ploughs into the slower moving AGB wind. The currently favored model is that the knots are formed by the onset of the PN phase and then sculpted as the ionizing radiation penetrates deeper into the circumstellar envelope. We present preliminary results of a study which compares the morphologies of molecular and ionized gas emission in several PNe, covering a range of ages.
    URI
    http://hdl.handle.net/10355/9930
    Citation
    AIP Conf. Proc. Volume 804, pp. 145-147
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    • Physics and Astronomy publications (MU)

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