Volume 384, Number 1, MarchII 2002
|Page(s)||195 - 205|
|Section||Interstellar and circumstellar matter|
|Published online||15 March 2002|
Pulsations and orbital modulation of the intermediate polar 1WGA J1958.2+3232
Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK e-mail: A.J.Norton@open.ac.uk; H.Quaintrell@open.ac.uk
2 Tuorla Observatory, Turku University, Väisäläntie 20, 21500 Piikkiö, Finland e-mail: email@example.com; firstname.lastname@example.org
3 NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 662, Greenbelt, MD 20771, USA Universities Space Research Association e-mail: email@example.com
4 Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France e-mail: firstname.lastname@example.org
Corresponding author: A. J. Norton, A.J.Norton@open.ac.uk
Accepted: 20 December 2001
We present optical photometry, spectroscopy and photopolarimetry, as well as ASCA X-ray observations, of the recently discovered intermediate polar 1WGA J1958.2+3232. Through the first detection of an optical beat frequency, we confirm the previously tentative suggestion that the spin period of the white dwarf is twice the X-ray and optical pulsation period, which we also confirm in each case. We detect an orbital modulation in each of the U, B, V, R and I bands for the first time, and suggest that the true orbital period is the -1d alias of that previously suggested. We also confirm the presence of circular polarization in this system, detecting a variable polarization which has opposite signs in each of the B and R bands. The double peaked pulse profile and oppositely signed polarization pulses suggest that 1WGA J1958.2+3232 accretes onto both magnetic poles via a disc which is truncated relatively close to the white dwarf.
Key words: novae, cataclysmic variables / stars: magnetic fields / stars: individual / 1WGA J1958.2+3232
© ESO, 2002
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