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dc.contributor.advisor O'Dell, C. Robert
dc.creatorHandron, Kerry Dorinda Patrick
dc.date.accessioned 2009-06-04T08:39:20Z
dc.date.available 2009-06-04T08:39:20Z
dc.date.issued 1996
dc.identifier.urihttps://hdl.handle.net/1911/17047
dc.description.abstract The central star of the Helix Nebula, the closest planetary nebula, is ringed by hundreds of Cometary Knots. Presented here are images taken with WFPC2 of a field in the northern portion of the bright ring and some physical parameters and models derived from the data. The field of view contains more than thirty well formed Cometary Knots and reveals that the entire bright ring is composed of knot-like structures. The data is in three narrow emission line filters, H$\alpha$, (OIII) and (NII). Optical thickness to ionizing photons for the knots is established, physical properties such as density in the ionized portions of the knots and dust mass are determined and the beginning of a model to explain the detailed structure set forth.
dc.format.extent 45 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectAstronomy
Astrophysics
dc.title Cometary knots in the Helix Nebula
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.identifier.citation Handron, Kerry Dorinda Patrick. "Cometary knots in the Helix Nebula." (1996) Master’s Thesis, Rice University. https://hdl.handle.net/1911/17047.


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