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Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey
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...
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| Format: | Thesis |
| Language: | English |
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Department of Astronomy
2016
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| _version_ | 1867613278194106368 |
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| access_status_str | Open Access |
| author | Hlabathe, Michael |
| author2 | Miszalski, Brent |
| author_browse | Hlabathe, Michael Miszalski, Brent |
| author_facet | Miszalski, Brent Hlabathe, Michael |
| author_sort | Hlabathe, Michael |
| collection | Thesis |
| description | 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%. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/20870 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:35.758Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Astronomy |
| publisherStr | Department of Astronomy |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/20870 Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey Hlabathe, Michael Miszalski, Brent McBride, Vanessa A Astronomy Astrophysics and Space Science 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%. 2016-07-27T10:25:46Z 2016-07-27T10:25:46Z 2016 Master Thesis Masters MSc http://hdl.handle.net/11427/20870 eng application/pdf Department of Astronomy Faculty of Science University of Cape Town |
| spellingShingle | Astronomy Astrophysics and Space Science Hlabathe, Michael Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| thesis_degree_str | Master's |
| title | Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| title_full | Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| title_fullStr | Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| title_full_unstemmed | Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| title_short | Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey |
| title_sort | post common envelope binary central stars of planetary nebulae in the ogle iv survey |
| topic | Astronomy Astrophysics and Space Science |
| url | http://hdl.handle.net/11427/20870 |
| work_keys_str_mv | AT hlabathemichael postcommonenvelopebinarycentralstarsofplanetarynebulaeintheogleivsurvey |