Intermediate Polars (DQ Her stars)

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Intermediate Polar
© 2001 M. A. Garlick: "Intermediate Polar" 		Intermediate Polar
© 1993 M. A. Garlick: "Magnetotruncation" 		---
In intermediate polars, the accretion disk is disrupted at small radii by the white dwarf magnetosphere; the accreting material then leaves the disk and follows the magnetic field lines down to the white dwarf surface in the vicinity of the magnetic poles.
As the accreting material rains down onto the white dwarf surface, it passes through a strong shock where its free-fall kinetic energy is converted into thermal energy. The shock temperature is ~ 108 K (10 keV), so the post-shock plasma is a strong source of hard X-rays.
The X-ray, ultraviolet, and optical radiation is pulsed at the spin period Pspin of the white dwarf and the beat period between spin and orbital periods: Pbeat = (Pspin-1 - Porb-1)-1.
Koji Mukai maintains an excellent webpage about intermediate polars.

The AAVSO has a webpage about the intermediate polar GK Persei.

C. W. Mauche & collaborators have written the following papers about intermediate polars:

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Fe L-Shell Density Diagnostics in Theory and Practice
Mauche, C. W., Liedahl, D. A., and Fournier, K. B.
2005, in X-ray Diagnostics for Astrophysical Plasmas: Theory, Experiment, and Observation, ed. R. K. Smith (New York: AIP), in press.
[UCRL-PROC-]
arXiv abstract

The Radial Velocity and Mass of the White Dwarf of EX Hydrae Measured with Chandra
Hoogerwerf, R., Brickhouse, N. S., and Mauche, C. W.
2004, Ap. J., 610, 411.
[UCRL-JRNL-202705]
ADS abstract ADS paper arXiv abstract

The Fe XXII I(11.92 A)/I(1.77 A) Density Diagnostic
Mauche, C. W., Liedahl, D. A., and Fournier, K. B.
2004, in IAU Coll. No. 190 - Magnetic Cataclysmic Variables, ed. S. Vrielmann and M. Cropper (San Francisco: ASP), in press.
[UCRL-JC-151385]
arXiv abstract

The Spin-Up Rate of the White Dwarf of GK Per
Mauche, C. W.
2004, in IAU Coll. No. 190 - Magnetic Cataclysmic Variables, ed. S. Vrielmann and M. Cropper (San Francisco: ASP), in press.
[UCRL-JC-151610]
arXiv abstract

The Fe XXII I(11.92 A)/I(1.77 A) Density Diagnostic Applied to the Chandra High Energy Transmission Grating Spectrum of EX Hydrae
Mauche, C. W., Liedahl, D. A., and Fournier, K. B.
2003, Ap. J., 588, 101.
[UCRL-JC-152616]
ADS abstract ADS paper arXiv abstract

Plasma Diagnostics in High-Resolution X-ray Spectra of Magnetic Cataclysmic Variables
Mauche, C. W.
2002, in The Physics of Cataclysmic Variables and Related Objects, ed. B. T. Gansicke, K. Beuermann, and K. Reinsch (San Francisco: ASP), 113.
[UCRL-JC-145738]
arXiv abstract

First Application of the Fe XVII I(17.10 A)/I(17.05 A) Line Ratio to Constrain the Plasma Density of a Cosmic X-ray Source
Mauche, C. W., Liedahl, D. A., and Fournier, K. B.
2001, Ap.J., 560, 992.
[UCRL-JC-143991]
ADS abstract ADS paper arXiv abstract

ORFEUS II and IUE Spectroscopy of EX Hydrae
Mauche, C. W.
1999, Ap. J., 520, 822.
[UCRL-JC-133669]
ADS abstract ADS paper arXiv abstract

Synthetic Spectra of Accretion Disks in DQ Her Binaries
Mauche, C. W., Miller, G. S., Raymond, J. C., and Lamb, F. K.
1990, in Accretion-Powered Compact Binaries, ed. C. W. Mauche (Cambridge: Cambridge Univ. Press), p. 195.
[LAUR-90-1495]
ADS abstract
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Novae CV Subtypes Non-Magnetic CVs Intermediate Polars Polars
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Last modified December 16, 2004
UCRL-MI-135159