7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Rapid Photometric variability of magnetic Cataclysmic Variables

10 Jul 2014, 14:40
Oral Presentation Track D1 - Astrophysics Space


Mr Johannes Breytenbach (University of Pretoria)

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Magnetic Cataclysmic Variables (mCVs) are semi-detached binary star systems consisting of a degenerate White Dwarf (WD) primary and a lower Main Sequence donor star. Material in these objects accretes from the donor star through a truncated disc where it eventually becomes channelled in the innermost regions by the strong (mega Gauss) magnetic field. As such, mCVs, and the extreme physical conditions they command, offer a unique probe into the properties of magnetically confined, supersonic plasma flows. The rapid photometric variability observed in these objects is thought to originate within the accretion column as the shock front - formed by material impacting on the WD surface - oscillates radially. By studying such Quasi-Periodic Oscillations (QPOs) - their relative stability, orbital phase- and system state dependencies - one may gain insight into the geometry of the accretion flow and magnetic field of the host star. This work represents the systematic study of the optical variability of a large number of southern hemisphere Polars with the goal of better understanding how magnetism affects accretion.

Main supervisor (name and email)<br>and his / her institution

David Buckley, dibnob@saao.ac.za, SAAO / SALT

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Primary author

Mr Johannes Breytenbach (University of Pretoria)


Dr David Buckley (Southern African Large Telescope)

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