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Simultaneous UBVRIJK Photometric and Polarimetric Observations of PQ Gem

Published online by Cambridge University Press:  12 April 2016

Stephen Potter ,
K. O. Mason ,
M. S. Cropper ,
J. A. Bailey  and
J. H. Hough
Stephen Potter
Affiliation:
Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, England
K. O. Mason
Affiliation:
Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, England
M. S. Cropper
Affiliation:
Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, England
J. A. Bailey
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
J. H. Hough
Affiliation:
Division of Physical Sciences, University of Hertfordshire, Herts, AL10 9AB, England

Extract

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We present simultaneous multiwavelength observations of the intermediate polar PQ Gem (Mason et al. 1992) obtained on 1993 February 18 and 19 using the Hatfield Polarimeter on UKIRT.

The data are folded on the 13.9 m spin period in Fig. 1. The light curves are double peaked at long wavelengths, with dips at phase ~ 0.15 and phase ~0.65, but almost sinusoidal in the U and B bands where the phase ~0.65 dip is absent. The percentage of circular polarisation also varies with the spin cycle, most notably in the I band, with both positive and negative excursions. The peaks in the positive and negative polarisation occur at phase ~ 0.15 and phase ~ 0.65 respectively, approximately coincident with the two intensity dips.

Type
Intermediate Polars
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 181 - 182
Copyright
Copyright © Kluwer 1996

References

Mason, K.O., Watson, M.G., Ponman, T.J., et al., 1992, MNRAS, 258, 794 Google Scholar
Meggitt, S.M., Wickramasinghe, D.T., 1982, MNRAS, 198, 71 Google Scholar
Piirola, V., Hakala, P., Coyne, G.V., 1993, Ap. J., 410, L107 Google Scholar