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dc.contributor.advisor O'Dell, C. Robert
dc.creatorHu, Xihai
dc.date.accessioned 2009-06-04T08:42:23Z
dc.date.available 2009-06-04T08:42:23Z
dc.date.issued 1996
dc.identifier.urihttps://hdl.handle.net/1911/19114
dc.description.abstract We have studied the high velocity flows and related shock phenomena in the Orion Nebula. Hubble Space Telescope WF/PC and WFPC2 images have been used in morphological studies and proper motion studies of the objects of interest. The high spectral resolution echelle slit spectra have been obtained for the central Orion Nebula in order to study both high velocity flows associated with compact objects and large scale high velocity systems. A group of Herbig-Haro objects located to the north of the Trapezium cluster have been studied in detail. Their morphology, proper motions and motions along the line of sight have been investigated. A bow shock model has been applied to predict the emission line profiles of bow shocks and the resultant line profiles were compared with the observed spectra. The comparison was successful except there is a discrepancy for one of the objects. The possible origin and evolution of this group of objects have been discussed. Two Herbig-Haro objects(HH203/HH204) in the vicinity of $\theta\sp2$A have also been studied both through the HST images and slit spectra. The possible nature of HH203 was suggested by comparing the emission line image with bow shock model predicted emission in inhomogeneous density environment. The spectra of Knot C has been presented and the nature of this object was discussed. We also reported the discovery of a Herbig-Haro like object-HH269, which is located to the southwest of the Trapezium cluster. A slit spectra mapping of the vicinity of the Trapezium cluster and HH202 have been done. The high velocity flows associated with several "proplyds" have been studied. A 1$\sp\prime$ diameter "receding disk" near the Trapezium cluster was found in (OIII) line spectra. A couple of complicated extended high velocity systems were found near HH202. The spectra of this region were presented.
dc.format.extent 136 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectAstronomy
Astrophysics
dc.title High velocity flows, shocks in the star forming H II region: The Orion 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 Doctoral
thesis.degree.name Doctor of Philosophy
dc.identifier.citation Hu, Xihai. "High velocity flows, shocks in the star forming H II region: The Orion Nebula." (1996) Diss., Rice University. https://hdl.handle.net/1911/19114.


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