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The properties of the SC stars and chemical composition of UY centauri
Bibliography: p. 185-292.
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
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Department of Astronomy
2016
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| _version_ | 1867613295593127936 |
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| access_status_str | Open Access |
| author | Catchpole, Robin Michael |
| author_browse | Catchpole, Robin Michael |
| author_facet | Catchpole, Robin Michael |
| author_sort | Catchpole, Robin Michael |
| collection | Thesis |
| description | Bibliography: p. 185-292. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/16968 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:51.607Z |
| 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:11427/16968 The properties of the SC stars and chemical composition of UY centauri Catchpole, Robin Michael Astronomy Bibliography: p. 185-292. This is primarily an observational thesis concerned firstly, with improving our knowlegde of the 12 SC stars, defined as a group by Catchpole and Feast (1971) and secondly, with determining the chemical composition of UY Cen, the brightest member of the group. An atlas, based on 13 A mm-1 spectra is presented for the S star π Gru and the C star 19 Psc between 5430 and 6850 A. In order to overcome the problems caused by the high density of absorption lines, we use a method of line identification that relies on the statistical interpretation of intensity against wavelength-agreement and Intensity against Excitation diagrams. The objective being to determine which elements are present in the spectrum before assigning identifications to individual lines. The spectrum is found to be rich in 's' process elements and shows weak molecules of both carbides, oxides and hydrides. U to L (0.36 to 3.4μ) photometry is listed for all the stars and shows them to be a very homogeneous group. A set of wavelengths derived from the line list is used to find the radial velocities of all the stars. A solar model atmosphere, with pure absorption as the method of line formation, is used to derive astrophysical log gf values from solar equivalent widths and meteor abundances. The model atmosphere also shows, that for our set of CN equivalent widths, both the CN abundance and the derived isotope ratio depend on the adopted C/O ratio. 2016-02-11T06:57:36Z 2016-02-11T06:57:36Z 1982 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/16968 eng application/pdf Department of Astronomy Faculty of Science University of Cape Town |
| spellingShingle | Astronomy Catchpole, Robin Michael The properties of the SC stars and chemical composition of UY centauri |
| thesis_degree_str | Doctoral |
| title | The properties of the SC stars and chemical composition of UY centauri |
| title_full | The properties of the SC stars and chemical composition of UY centauri |
| title_fullStr | The properties of the SC stars and chemical composition of UY centauri |
| title_full_unstemmed | The properties of the SC stars and chemical composition of UY centauri |
| title_short | The properties of the SC stars and chemical composition of UY centauri |
| title_sort | properties of the sc stars and chemical composition of uy centauri |
| topic | Astronomy |
| url | http://hdl.handle.net/11427/16968 |
| work_keys_str_mv | AT catchpolerobinmichael thepropertiesofthescstarsandchemicalcompositionofuycentauri AT catchpolerobinmichael propertiesofthescstarsandchemicalcompositionofuycentauri |