Advertisement

What is the Magnetic Field of the DQ Herculis Binaries?

  • J. B. G. Canalle
  • R. Opher
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 218)

Abstract

The DQ Herculis (DQ Her) binary systems are a subgroup of the magnetic cataclysmic variables. The standard model for these systems is a white dwarf that accretes matter from a red dwarf companion that is overflowing its Roche lobe. The in falling matter can form an accretion disk before it is coupled to the magnetic field close to the white dwarf. In general they do not exhibit polarization in their optical or infrared light, except in BG CMi (West et al 1987). Thus the intensity of the magnetic field of the accreting objects have not been directly measured and are somewhat uncertain; observable characteristics have been used to estimate B ~ 104–107 G (Lamb & Patterson 1983). Reviews of the DQ Her objects can be found in Cropper 1990. We follow the calculation of Canalle & Opher 1991 (paper 1) but with the fundamental difference that the accretion column has a cylindrical hole inside the center of the accretion column.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Barrett, P. E., Chanmugam, G., 1985, ApJ 298, 743CrossRefGoogle Scholar
  2. Canalle, J. B. G., Opher, R., 1988, A. A 189, 325Google Scholar
  3. Canalle, J. B. G., Opher, R., 1991, A. A 251, 474Google Scholar
  4. Cropper, M, 1990, Space Sci. Reviews 54, 195CrossRefGoogle Scholar
  5. Frank, J., Chanmugam, G., 1990, ApJ 365, 660CrossRefGoogle Scholar
  6. Lamb, D. Q., Patterson, J, 1983, in Cataclysmic Variables and Related Objects, ed. M. Livio, G. Shaviv (Dordrecht: Reidel), p. 229Google Scholar
  7. Ramaty, R., 1969, ApJ 158, 753CrossRefGoogle Scholar
  8. West, S. C., Berriman, G., Schmidt, G. D., 1987, ApJ 322, L35CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • J. B. G. Canalle
    • 1
  • R. Opher
    • 2
  1. 1.Instituto de FísicaUniversidade do Estado do Rio de JaneiroRio de Janeiro — RJBrazil
  2. 2.Instituto Astronômico e GeofísicoUniversidade de São PauloSão Paulo — SPBrazil

Personalised recommendations