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Astron. Astrophys. 335, 583-586 (1998)

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Linear polarization of monochromatic oscillations in optical spectrum of the intermediate polar PQ Geminorum *

N.N. Somov, T.A. Somova and I.D. Najdenov

Special Astrophysical Observatory of the Russian AS, 357147 Nizhnij Arkhyz, Russia (som@sao.ru)

Received 26 February 1998 / Accepted 6 April 1998


We report the results of optical dynamic spectropolarimetry of the intermediate polar PQ Gem (RE 0751+14), which were obtained with the help of the linear polarization analyzer and the BTA scanner in a high time resolution mode (32 ms) at the 6 m telescope on November 19, 1996. Narrow-band spectral oscillations in the vicinity of the spin period (13.9 min) have been investigated. The dependence of the power of oscillations on the wavelengths (3800-5200 Å, 1 Å/channel) and periods of pulsations in the region 300-2000 s with a mean resolution along the period 10 s has been calculated. Power spectra have revealed strong (amplitude [FORMULA]), polarized (dominating in one of the orthogonal polarizations), monochromatic (FWHM in power spectra 2-3 Å) oscillations with periods of 13.3-15.2 min mainly in the profiles of emission lines. The strong dynamic linear polarization (70-80%) with the already detected strong dynamic circular polarization (60-90%) of the monochromatic oscillations make practically impossible any interpretation of the oscillations in the frame of conventional physics.

Key words: stars: individual: PQ Gem= RE 0751+14 – stars: magnetic fields – stars: rotation – stars: oscillations – X-rays: stars

* Based on observations from Special Astrophysical Observatory of Russian Academy of Sciences, Russia.

Send offprint requests to: N.N. Somov

© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998