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The EUV Excess in Magnetic Cataclysmic Variables

Published online by Cambridge University Press:  12 April 2016

John K. Warren  and
Koji Mukai
John K. Warren
Affiliation:
Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
Koji Mukai
Affiliation:
Code 668, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA

Abstract

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We present preliminary analysis of EUVE pointed data of 8 magnetic cataclysmic variables. Blackbody temperatures, luminosities, and interstellar columns have been better constrained. Using these luminosities we look for correlations between the EUV excess (over optical and hard X-rays) and various system parameters. While it appears there is no correlation between the EUV excess and the system inclination and orbital period, correlations are suggested between the EUV excess and the longitude of the accretion spot, the colatitude of the accretion spot, the white dwarf magnetic field, and the magnetic capture radius.

Type
VI. Cataclysmic Variable Stars
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 325 - 329
Copyright
Copyright © Kluwer 1996

References

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Bowyer, S. & Malina, R.F. 1991, The EUVE Mission, in Extreme Ultraviolet Astronomy, ed. Malina, R.F. & Bowyer, S., New York: Pergamon Press, 397 CrossRefGoogle Scholar
Cropper, M.S. 1990, The Polars, Space Sci. Rev., 54, 195 Google Scholar
Frank, J., King, A.R. & Lasota, J.-P. 1988, The soft X-ray excess in accreting magnetic white dwarfs, A&A, 193, 113 Google Scholar
Kuijpers, J. & Pringle, J.E. 1982, Comments on radial white dwarf accretion, A&AL, 114, L4–L6 Google Scholar
Mukai, K. 1988, Accretion streams in AM Her type systems., MNRAS, 232, 175 Google Scholar
Ramsay, G., Mason, K.O., Cropper, M., Watson, M.G. & Clayton, K.L. 1994, ROSAT observations of AN UMa and MR Ser: the status of the soft X-ray excess in AM Her stars., MNRAS, 270, 692 Google Scholar