Standard magnitude sequences in the Harvard standard regions at -45° declination

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dc.contributor.authorCousins, Alan William Jamesen_ZA
dc.date.accessioned2016-10-25T13:38:42Z
dc.date.available2016-10-25T13:38:42Z
dc.date.issued1954en_ZA
dc.description.abstractAccurate 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.en_ZA
dc.identifier.apacitationCousins, A. W. J. (1954). <i>Standard magnitude sequences in the Harvard standard regions at -45° declination</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/22307en_ZA
dc.identifier.chicagocitationCousins, Alan William James. <i>"Standard magnitude sequences in the Harvard standard regions at -45° declination."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Astronomy, 1954. http://hdl.handle.net/11427/22307en_ZA
dc.identifier.citationCousins, A. 1954. Standard magnitude sequences in the Harvard standard regions at -45° declination. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Cousins, Alan William James AB - 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. DA - 1954 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1954 T1 - Standard magnitude sequences in the Harvard standard regions at -45° declination TI - Standard magnitude sequences in the Harvard standard regions at -45° declination UR - http://hdl.handle.net/11427/22307 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22307
dc.identifier.vancouvercitationCousins AWJ. Standard magnitude sequences in the Harvard standard regions at -45° declination. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Astronomy, 1954 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22307en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Astronomyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherAstronomyen_ZA
dc.titleStandard magnitude sequences in the Harvard standard regions at -45° declinationen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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