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Open clusters and HII regions of our Galaxy
Open clusters are essential laboratories for understanding stellar evolution, as they allow constraints to be placed on stellar ages and luminosities. As distance indicators they are also important tracers of star formation in the Milky Way. One such cluster is Trumpler 27 that we identified for det...
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| Format: | Thesis |
| Language: | Eng |
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Department of Astronomy
2016
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| _version_ | 1867614047746129920 |
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| access_status_str | Open Access |
| author | Obonyo, Willice Odhiambo |
| author2 | McBride, Vanessa |
| author_browse | McBride, Vanessa Obonyo, Willice Odhiambo |
| author_facet | McBride, Vanessa Obonyo, Willice Odhiambo |
| author_sort | Obonyo, Willice Odhiambo |
| collection | Thesis |
| description | Open clusters are essential laboratories for understanding stellar evolution, as they allow constraints to be placed on stellar ages and luminosities. As distance indicators they are also important tracers of star formation in the Milky Way. One such cluster is Trumpler 27 that we identified for detailed study.The aim of the study is to estimate the distance, radial velocity, age, membership and reddening of the cluster using both spectroscopic and photometric techniques. We used new spectroscopic data collected from SAAO's 1.9m telescope together with existing photometric data from catalogues in the study of Trumpler 27. The spectra collected were classified using spectral atlases to determine the reddening in the field. Stars of the cluster were identified using selection techniques that made use of both infrared and optical Q parameters, spatial distribution and photometric techniques. The result from this work suggest that Trumpler 27 is made up of ~ 55 stars which are at different stages of evolution. The stars include main sequence stars, blue supergiants, two cool supergiants and maybe two WR stars. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19997 |
| institution | University of Cape Town (South Africa) |
| language | Eng |
| last_indexed | 2026-06-10T12:45:50.295Z |
| 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:11427/19997 Open clusters and HII regions of our Galaxy Obonyo, Willice Odhiambo McBride, Vanessa Astrophysics and Space Science Open clusters are essential laboratories for understanding stellar evolution, as they allow constraints to be placed on stellar ages and luminosities. As distance indicators they are also important tracers of star formation in the Milky Way. One such cluster is Trumpler 27 that we identified for detailed study.The aim of the study is to estimate the distance, radial velocity, age, membership and reddening of the cluster using both spectroscopic and photometric techniques. We used new spectroscopic data collected from SAAO's 1.9m telescope together with existing photometric data from catalogues in the study of Trumpler 27. The spectra collected were classified using spectral atlases to determine the reddening in the field. Stars of the cluster were identified using selection techniques that made use of both infrared and optical Q parameters, spatial distribution and photometric techniques. The result from this work suggest that Trumpler 27 is made up of ~ 55 stars which are at different stages of evolution. The stars include main sequence stars, blue supergiants, two cool supergiants and maybe two WR stars. 2016-06-10T07:38:31Z 2016-06-10T07:38:31Z 2015 Master Thesis Masters MSc http://hdl.handle.net/11427/19997 Eng application/pdf Department of Astronomy Faculty of Science University of Cape Town |
| spellingShingle | Astrophysics and Space Science Obonyo, Willice Odhiambo Open clusters and HII regions of our Galaxy |
| thesis_degree_str | Master's |
| title | Open clusters and HII regions of our Galaxy |
| title_full | Open clusters and HII regions of our Galaxy |
| title_fullStr | Open clusters and HII regions of our Galaxy |
| title_full_unstemmed | Open clusters and HII regions of our Galaxy |
| title_short | Open clusters and HII regions of our Galaxy |
| title_sort | open clusters and hii regions of our galaxy |
| topic | Astrophysics and Space Science |
| url | http://hdl.handle.net/11427/19997 |
| work_keys_str_mv | AT obonyowilliceodhiambo openclustersandhiiregionsofourgalaxy |