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Standard magnitude sequences in the Harvard standard regions at -45° declination
Accurate stellar magnitudes on a uniform system are necessary for astronomical research. The North Polar Sequence, which defines the International System, is not accessible to southern observers so it has been necessary to establish magnitude sequences in the Southern Hemisphere. A number of observi...
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| Format: | Thesis |
| Language: | English |
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Department of Astronomy
2016
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| _version_ | 1867613334649438209 |
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| access_status_str | Open Access |
| author | Cousins, Alan William James |
| author_browse | Cousins, Alan William James |
| author_facet | Cousins, Alan William James |
| author_sort | Cousins, Alan William James |
| collection | Thesis |
| description | Accurate stellar magnitudes on a uniform system are necessary for astronomical research. The North Polar Sequence, which defines the International System, is not accessible to southern observers so it has been necessary to establish magnitude sequences in the Southern Hemisphere. A number of observing programmes to establish such sequences in the nine Harvard Standard E Regions have been carried out using modern methods. Two of these programmes employing the Fabry method and a photoelectric photometer, respectively, are described in some detail. A special series of observations was made to ensure that the nine E regions have the same zero point. Accurate photographic and photovisual magnitudes were obtained for about 270 of the brighter stars. In a concluding section, modern material is collected and combined to give accurate magnitudes, the majority in two colours, for 640 stars, and approximate data for many more. The data have been examined and found to be free from systematic errors between magnitudes 3.0 and 10.0. The reductions to the adopted colour systems are also satisfactory. The most urgent need at present is for more observations of the fainter stars. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22307 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:28.941Z |
| 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:11427/22307 Standard magnitude sequences in the Harvard standard regions at -45° declination Cousins, Alan William James Astronomy Accurate stellar magnitudes on a uniform system are necessary for astronomical research. The North Polar Sequence, which defines the International System, is not accessible to southern observers so it has been necessary to establish magnitude sequences in the Southern Hemisphere. A number of observing programmes to establish such sequences in the nine Harvard Standard E Regions have been carried out using modern methods. Two of these programmes employing the Fabry method and a photoelectric photometer, respectively, are described in some detail. A special series of observations was made to ensure that the nine E regions have the same zero point. Accurate photographic and photovisual magnitudes were obtained for about 270 of the brighter stars. In a concluding section, modern material is collected and combined to give accurate magnitudes, the majority in two colours, for 640 stars, and approximate data for many more. The data have been examined and found to be free from systematic errors between magnitudes 3.0 and 10.0. The reductions to the adopted colour systems are also satisfactory. The most urgent need at present is for more observations of the fainter stars. 2016-10-25T13:38:42Z 2016-10-25T13:38:42Z 1954 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22307 eng application/pdf Department of Astronomy Faculty of Science University of Cape Town |
| spellingShingle | Astronomy Cousins, Alan William James Standard magnitude sequences in the Harvard standard regions at -45° declination |
| thesis_degree_str | Doctoral |
| title | Standard magnitude sequences in the Harvard standard regions at -45° declination |
| title_full | Standard magnitude sequences in the Harvard standard regions at -45° declination |
| title_fullStr | Standard magnitude sequences in the Harvard standard regions at -45° declination |
| title_full_unstemmed | Standard magnitude sequences in the Harvard standard regions at -45° declination |
| title_short | Standard magnitude sequences in the Harvard standard regions at -45° declination |
| title_sort | standard magnitude sequences in the harvard standard regions at 45° declination |
| topic | Astronomy |
| url | http://hdl.handle.net/11427/22307 |
| work_keys_str_mv | AT cousinsalanwilliamjames standardmagnitudesequencesintheharvardstandardregionsat45declination |