Browsing by Author "Charles, PA"

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    Exploring the super-orbital periodic behaviour of X-Ray binaries
    (2012) Kotze, Marissa Mimi; Charles, PA; Warner, Brian
    Quasi-periodic super-orbital modulations are an established feature of several luminous X-ray binaries. The mechanisms that have been proposed to be responsible for such modulations include irradiation-driven warping/tilting and tidally-induced precession of the accretion disc, jet precession and the modulation of the mass-transfer rate due to an accretion disc instability or the effects of a third body.
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    Long-term properties of X-ray binaries in the magellanic clouds
    (2013) Rajoelimanana, Andry Fitiavana; Charles, PA; Warner, Brian
    Long-term variability in all types of X-ray binaries is a well established characteristic, but due to observation limitations and lack of long-term monitoring capability these variations have not been studied before in a systematic way. In this thesis, we exploit the ~ 16 yr optical light curves from the MACHO and OGLE databases, and combine these with archival XMM-Newton X-ray observations to study the long-term properties of Be/X-ray binaries and Supersoft X-ray Sources in the Magellanic Clouds.