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dc.contributor.advisorBalona, L. A.
dc.contributor.advisorMeintjes, P. J.
dc.contributor.authorEvers, Elizabeth Anne
dc.date.accessioned2017-06-06T06:20:57Z
dc.date.available2017-06-06T06:20:57Z
dc.date.issued1998-10
dc.identifier.urihttp://hdl.handle.net/11660/6335
dc.description.abstractThis thesis discusses mode-identification from multicolour photometry. First, the need for a better mode identification technique for stars that have significant phase differences between the light curves in different colours is addressed. The necessary equation needed for modeidentification from photometry is then derived and briefly discussed. Then, a new, statistically based algorithm for mode-identification is developed by extending and adapting a method that has been applied to pulsating white dwarfs, to include the information provided by the different phases of the light curves in different wavelengths. This new algorithm allows the best estimate of the spherical harmonic degree l to be determined, as well as a confidence level from which the uniqueness of the mode-identification can be ascertained. The algorithm is then applied to a selection of well-observed 8 Seuti stars with the necessary multicolour photometry. It is found that it works well for high amplitude 8 Set stars, but that discrimination between the l = 0 and l = 1 modes is sometimes poor for the low amplitude stars. An algorithm to deduce the effective temperature, luminosity and equatorial velocity from the observed frequencies is also proposed. It is found that some mode-identification is necessary to obtain a unique solution of the stellar parameters. The method is applied to a subset of the 8 Set stars which have a suitable number of frequencies and suitable mode identifications.en_ZA
dc.description.sponsorshipSouth African Astronomical Observatoryen_ZA
dc.language.isoenen_ZA
dc.publisherUniversity of the Free Stateen_ZA
dc.subjectPulsating starsen_ZA
dc.subjectStars -- Structureen_ZA
dc.subjectStellar ascillationsen_ZA
dc.subjectDissertation (M.Sc. (Physics))--University of the Free State, 1998en_ZA
dc.titleMode identification in delta δ Scuti starsen_ZA
dc.typeDissertationen_ZA
dc.rights.holderUniversity of the Free Stateen_ZA


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