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The structure of the large magellanic cloud
This work gives an account of the study of the metallicity [Fe/H] distribution (gradient) in the oldest population in the Large Magellanic Cloud (LMC), by making use of the available RR Lyrae data from the Optical Gravitational Lensing Experiment III (OGLE III). RR Lyrae stars are amongst the oldest...
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| Format: | Thesis |
| Language: | English Eng |
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Department of Astronomy
2024
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| _version_ | 1867613244699443200 |
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| access_status_str | Open Access |
| author | Abedigamba_OP, Oyirwoth |
| author2 | Feast, Michael |
| author_browse | Abedigamba_OP, Oyirwoth Feast, Michael |
| author_facet | Feast, Michael Abedigamba_OP, Oyirwoth |
| author_sort | Abedigamba_OP, Oyirwoth |
| collection | Thesis |
| description | This work gives an account of the study of the metallicity [Fe/H] distribution (gradient) in the oldest population in the Large Magellanic Cloud (LMC), by making use of the available RR Lyrae data from the Optical Gravitational Lensing Experiment III (OGLE III). RR Lyrae stars are amongst the oldest objects in the universe and they have a range in element (metal) abundances. Measuring the distribution of metallicities of RR Lyrae stars in a galaxy gives one clues to the origin of galaxies. It is known that the pulsation periods of RR Lyraes is broadly correlated with their metallicity. This fact has been used for investigating the metallicity distribution of RR Lyrae stars in the LMC. I have found an indication that the proportion of metal poor RR Lyrae stars increases with distance from the centre of the LMC. In addition, an attempt was made to improve the metallicity-period relation by introducing the Fourier parameters, but this was unsuccessful. Lastly, a comparison is made with estimates of metallicity gradients of other LMC populations. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/40533 |
| institution | University of Cape Town (South Africa) |
| language | English Eng |
| last_indexed | 2026-06-10T12:33:04.194Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| 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:11427/40533 The structure of the large magellanic cloud Abedigamba_OP, Oyirwoth Feast, Michael Whitelock, Patricia Astronomy; Large Magellanic Cloud; RR Lyrae stars; Optical Gravitational Lensing Experiment; Fourier parameters; metallicity [Fe/H] This work gives an account of the study of the metallicity [Fe/H] distribution (gradient) in the oldest population in the Large Magellanic Cloud (LMC), by making use of the available RR Lyrae data from the Optical Gravitational Lensing Experiment III (OGLE III). RR Lyrae stars are amongst the oldest objects in the universe and they have a range in element (metal) abundances. Measuring the distribution of metallicities of RR Lyrae stars in a galaxy gives one clues to the origin of galaxies. It is known that the pulsation periods of RR Lyraes is broadly correlated with their metallicity. This fact has been used for investigating the metallicity distribution of RR Lyrae stars in the LMC. I have found an indication that the proportion of metal poor RR Lyrae stars increases with distance from the centre of the LMC. In addition, an attempt was made to improve the metallicity-period relation by introducing the Fourier parameters, but this was unsuccessful. Lastly, a comparison is made with estimates of metallicity gradients of other LMC populations. 2024-08-29T11:44:02Z 2024-08-29T11:44:02Z 2010 2024-08-29T11:38:45Z Thesis / Dissertation Masters Masters http://hdl.handle.net/11427/40533 en Eng application/pdf Department of Astronomy Faculty of Science University of Cape Town |
| spellingShingle | Astronomy; Large Magellanic Cloud; RR Lyrae stars; Optical Gravitational Lensing Experiment; Fourier parameters; metallicity [Fe/H] Abedigamba_OP, Oyirwoth The structure of the large magellanic cloud |
| thesis_degree_str | Master's |
| title | The structure of the large magellanic cloud |
| title_full | The structure of the large magellanic cloud |
| title_fullStr | The structure of the large magellanic cloud |
| title_full_unstemmed | The structure of the large magellanic cloud |
| title_short | The structure of the large magellanic cloud |
| title_sort | structure of the large magellanic cloud |
| topic | Astronomy; Large Magellanic Cloud; RR Lyrae stars; Optical Gravitational Lensing Experiment; Fourier parameters; metallicity [Fe/H] |
| url | http://hdl.handle.net/11427/40533 |
| work_keys_str_mv | AT abedigambaopoyirwoth thestructureofthelargemagellaniccloud AT abedigambaopoyirwoth structureofthelargemagellaniccloud |