Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey

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dc.contributor.advisorMiszalski, Brenten_ZA
dc.contributor.advisorMcBride, Vanessa Aen_ZA
dc.contributor.authorHlabathe, Michaelen_ZA
dc.date.accessioned2016-07-27T10:25:46Z
dc.date.available2016-07-27T10:25:46Z
dc.date.issued2016en_ZA
dc.description.abstractPlanetary Nebulae (PNe) are defined as the ionized shells of circumstellar gas ejected through an intense stellar wind at the end of the star's life. PNe come in different shapes, from spherical to highly complex, non-spherical shapes. Mass loss in AGB stars is presumed as the shaping mechanism but how it results in different PNe morphologies is still unclear. Binary central stars that have undergone common envelope evolution are thought to be a possible solution to this longstanding problem. Using photometry from the OGLEIV survey, we present the newly identified close binary central stars of Planetary Nebulae (CSPNe), six in total. Of the six PNe with close binary CSPNe, one looks spherical which presents a very interesting argument in terms of our understanding of PNe evolution. The orbital distribution is derived and compared against current orbital distribution for binary CSPNe, with most binaries from the distribution exhibiting orbital periods less than a day. A binary fraction estimate of 6% is presented and possible cases are discussed that might have influenced our estimation to be different from the expected 10-15%.en_ZA
dc.identifier.apacitationHlabathe, M. (2016). <i>Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/20870en_ZA
dc.identifier.chicagocitationHlabathe, Michael. <i>"Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Astronomy, 2016. http://hdl.handle.net/11427/20870en_ZA
dc.identifier.citationHlabathe, M. 2016. Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hlabathe, Michael AB - Planetary Nebulae (PNe) are defined as the ionized shells of circumstellar gas ejected through an intense stellar wind at the end of the star's life. PNe come in different shapes, from spherical to highly complex, non-spherical shapes. Mass loss in AGB stars is presumed as the shaping mechanism but how it results in different PNe morphologies is still unclear. Binary central stars that have undergone common envelope evolution are thought to be a possible solution to this longstanding problem. Using photometry from the OGLEIV survey, we present the newly identified close binary central stars of Planetary Nebulae (CSPNe), six in total. Of the six PNe with close binary CSPNe, one looks spherical which presents a very interesting argument in terms of our understanding of PNe evolution. The orbital distribution is derived and compared against current orbital distribution for binary CSPNe, with most binaries from the distribution exhibiting orbital periods less than a day. A binary fraction estimate of 6% is presented and possible cases are discussed that might have influenced our estimation to be different from the expected 10-15%. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey TI - Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey UR - http://hdl.handle.net/11427/20870 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20870
dc.identifier.vancouvercitationHlabathe M. Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Astronomy, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20870en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Astronomyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherAstronomyen_ZA
dc.subject.otherAstrophysics and Space Scienceen_ZA
dc.titlePost-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV surveyen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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