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Discless Accretion in Intermediate Polars?

Published online by Cambridge University Press:  12 April 2016

David A.H. Buckley
David A.H. Buckley*
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa

Abstract

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I review the evidence for disc and discless accretion in the asynchronous magnetic CVs, the intermediate polars (IPs). The presence and relative amplitudes of the spin and synodic (beat) X-ray periods, and related orbital sidebands, are very model dependent, and support disc accretion dominating in all the well-studied IPs. A component of non-disc accretion is sometimes observed, a result of stream overflow penetrating to the magnetosphere, and is responsible for the synodic period. The recently discovered polarized IP, RX J1712.6–2414, is a prime candidate (the first) for purely discless, stream-fed accretion in such a system. While the polarisation varies at the spin period, the X-ray variations occur at the synodic period, a result of the modulation in the mass transfer rate for a discless accretor.

Type
Part 9. Accretion Curtains and Funnels
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 420 - 423
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

Buckley, D.A.H. & Tuohy, I.R. 1989, ApJ, 344, 376 Google Scholar
Buckley, D.A.H. & Shafter, A.W. 1995, MNRAS, 275, L61 Google Scholar
Buckley, D.A.H., et al. 1995, MNRAS, 275, 1028 Google Scholar
Buckley, D.A.H., et al. 1996, MNRAS, submittedGoogle Scholar
Cropper, M.S. 1990, Space Sci. Rev., 54, 195 Google Scholar
Chanmugam, G. & Ray, A. 1984, ApJ, 285, 252 Google Scholar
Garlick, M.A. 1996, MNRAS, in pressGoogle Scholar
Haswell, C. et al. 1994, ASP Conf. Ser. 56, 268 Google Scholar
Hellier, C. 1991 MNRAS, 251, 693 Google Scholar
Heilier, C. 1992, MNRAS, 258, 578 CrossRefGoogle Scholar
Hellier, C. et al. 1989, MNRAS, 238, 1107 Google Scholar
Hellier, C., Mason, K.O. & Cropper, M.S. 1990, MNRAS, 242, 250 Google Scholar
Lubow, S. 1989, ApJ, 340, 1064 Google Scholar
Mason, K.O., Rosen, S.R. & Hellier, C. 1988, Adv. Space Res., 8(2), 293 CrossRefGoogle Scholar
Patterson, J. 1994, PASP, 106, 209 Google Scholar
Piirola, V., Hakala, P. & Coyne, G.V. 1993, ApJ, 410, L107 Google Scholar
Taylor, P., Norton, A.J. & Beardmore, A.P. 1995, ASP Conf. Ser., 85, 202 Google Scholar
Väth, H. 1996, A&A, in pressGoogle Scholar
Warner, B. 1995, Cataclysmic Variable Stars. Cambridge University Press, Cambridge, p. 376 CrossRefGoogle Scholar
Wickramasinghe, D.T., Wu, K. & Ferrano, L. 1991, MNRAS, 249, 460 Google Scholar
Wynn, G. & King, A.R. 1993, MNRAS, 255, 83 Google Scholar