On the model for U Geminorum

 

Show simple item record

dc.contributor.advisor Warner, Brian en_ZA
dc.contributor.author Harwood, John Malcolm en_ZA
dc.date.accessioned 2016-03-28T14:42:52Z
dc.date.available 2016-03-28T14:42:52Z
dc.date.issued 1973 en_ZA
dc.identifier.citation Harwood, J. 1973. On the model for U Geminorum. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18324
dc.description.abstract The term cataclysmic variable comprises several types of variable star - novae, recurrent novae, dwarf novae; and to these we add the nova-like variables, stars which exhibit many of the characteristics of the novae but which have not been observed to erupt. U Geminorum, discovered by Hinds in 1855, is the nomotype of the dwarf novae. These stars are characterised by large, abrupt, temporary increases in brightness that occur erratically at intervals of ten days to a year or more. The dwarf novae are faint objects, few reaching 11th magnitude at maximum, whereas at minimum light most are fainter than 16th magnitude. Thus they are spectroscopically inaccessible to all but the largest telescopes. Conventional photometric techniques applied to these objects gave no information indicating their physical nature. The time-scale of the observations was so long that only the gross variations in brightness were detected. Much of the observing was undertaken by amateurs (Fig. 1), and from this work several of the basic features of this group have emerged. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Astronomy en_ZA
dc.title On the model for U Geminorum en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Astronomy en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Harwood, J. M. (1973). <i>On the model for U Geminorum</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/18324 en_ZA
dc.identifier.chicagocitation Harwood, John Malcolm. <i>"On the model for U Geminorum."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Astronomy, 1973. http://hdl.handle.net/11427/18324 en_ZA
dc.identifier.vancouvercitation Harwood JM. On the model for U Geminorum. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Astronomy, 1973 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18324 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Harwood, John Malcolm AB - The term cataclysmic variable comprises several types of variable star - novae, recurrent novae, dwarf novae; and to these we add the nova-like variables, stars which exhibit many of the characteristics of the novae but which have not been observed to erupt. U Geminorum, discovered by Hinds in 1855, is the nomotype of the dwarf novae. These stars are characterised by large, abrupt, temporary increases in brightness that occur erratically at intervals of ten days to a year or more. The dwarf novae are faint objects, few reaching 11th magnitude at maximum, whereas at minimum light most are fainter than 16th magnitude. Thus they are spectroscopically inaccessible to all but the largest telescopes. Conventional photometric techniques applied to these objects gave no information indicating their physical nature. The time-scale of the observations was so long that only the gross variations in brightness were detected. Much of the observing was undertaken by amateurs (Fig. 1), and from this work several of the basic features of this group have emerged. DA - 1973 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1973 T1 - On the model for U Geminorum TI - On the model for U Geminorum UR - http://hdl.handle.net/11427/18324 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record