On the area of accretion curtains from fast aperiodic time variability of the intermediate polar EX Hya

We present results of a study of the fast timing variability of the magnetic cataclysmic variable (mCV) EX Hya. It was previously shown that one may expect the rapid flux variability of mCVs to be smeared out at timescales shorter than the cooling time of hot plasma in the post shock region of the a...

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Bibliographic Details
Published in:arXiv.org 2014-05
Main Authors: Semena, Andrey N, Revnivtsev, Mikhail G, Buckley, David A H, Kotze, Marissa M, Khabibullin, Ildar I, Breytenbach, Hannes, Gulbis, Amanda A S, Coppejans, Rocco, Potter, Stephen B
Format: Article
Language:English
Subjects:
Cataclysmic variables
Cooling
Cooling rate
Curtains
Deposition
Footprints
Magnetospheres
Mapping
Penetration depth
Plasma
Plasma cooling
Telescopes
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Summary:We present results of a study of the fast timing variability of the magnetic cataclysmic variable (mCV) EX Hya. It was previously shown that one may expect the rapid flux variability of mCVs to be smeared out at timescales shorter than the cooling time of hot plasma in the post shock region of the accretion curtain near the WD surface. Estimates of the cooling time and the mass accretion rate, thus provide us with a tool to measure the density of the post-shock plasma and the cross-sectional area of the accretion funnel at the WD surface. We have probed the high frequencies in the aperiodic noise of one of the brightest mCV EX Hya with the help of optical telescopes, namely SALT and the SAAO 1.9m telescope. We place upper limits on the plasma cooling timescale \(\tau
ISSN:2331-8422
DOI:10.48550/arxiv.1405.0855