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Characterising the Dwarf nova population of the Catalina real-time transient survey

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dc.contributor.advisor Woudt PA, Prof en
dc.contributor.author De Bude DL en
dc.date.accessioned 2016-09-22T09:15:13Z
dc.date.available 2016-09-22T09:15:13Z
dc.date.submitted 2011 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/50537
dc.description.abstract A photometric follow-up study was performed on 50 of the Cataclysmic Variables (CVs) identified by the Catalina Real-time Transient Survey (CRTS). The sample, consisting of 46 Dwarf Novae (DNe) and four magnetic CVs, was analysed in order to classify the systems, determine parameters such as the orbital period and investigate behaviour such as quasi-periodic oscillations. This work represents 21 weeks of observations taken between December 2009 and May 2011, performed on the 40-in and 74-in telescopes at the Sutherland site of the South African Astronomical Observatory. The orbital periods determined in this study were combined with those in the literature to give an orbital period distribution for the CRTS CVs. This distribution shows an accumulation of systems near the period minimum - an independent confirmation of the existence of the long-predicted period spike eventually detected in the Sloan Digital Sky Survey (SDSS) by Gaensicke et al. (2009). The CRTS spike is found at 80-86 minutes, which is in the same range as the SDSS (82-88 minutes), but longer than the predicted value of approximately 70 minutes (Kolb & Baraffe 1999). A population of intrinsically faint CVs below the period minimum is also seen in the CRTS distribution - the outbursting AM CVn systems. The ~7-year CRTS light curves have enabled the distribution to be separated into different outburst frequency classes. The resultant distributions show a dependency of the outburst frequency on the orbital period, with the systems showing less frequent outbursts found at shorter orbital periods. Additionally, the subset of CRTS CVs showing only 1 outburst may contain post bounce systems. Finally, a literature study on radio detections of DNe is carried out with the aim of selecting targets for follow-up studies by the MeerKAT transients project, ThunderKAT. en
dc.language English en
dc.subject Astronomy en
dc.title Characterising the Dwarf nova population of the Catalina real-time transient survey en
dc.type Masters degree en
dc.description.degree MSc en

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