[vsnet-chat 668] RXJ 0558.0+5353

[Nikolay Shakhovskoy <shakh@crao.crimea.ua>]

                 RXJ 0558.0+5353

Periodic variations of the circular polarization were detected at 1997
October,4 at the Shajn 2.6m telescope of the Crimean Astrophysical
Observatory with a period P=0.006301+-.000055 days (544.4+-4.8 sec)
and semi-amplitude of 1.80+-0.16 per cents. Observations were made
with one-channel polarimeter with fast rotating achromatic quater-wave
plate and broad red filter (0.500-0.750 nm). Variation of the circular
polarization are sinusoidal with changing of the polarity.
The photometric variations of the same run show the variability with a
period P=.003592+-.000012. However, the peaks at the periodogram are
accompanied by the aliases, one of which corresponds to the double
frequency (P=.003120+-.000012 d =  269.5+-1.0 s) and the amplitude
0.035+-.003 mag. This period is very near to the period 272.785 sec,
detected by Ashoka et al.(A&A,1995,297,L83) in white light and period
272.74 sec which was found by Haberl et al.(A&A,1994,291,171) in X-ray.
Light maximuma are coincided with the exstrema positive and negative
circular polarization. Photometric observations at the same night at
1.25 m telescope show the next UBVRI Johnson magnitudes: U=13.29;
B=13.98; V=13.91; R=13.49; I=13.31.
The possible interpretation is the rotation of the magnetized white
dwarf with the period 545 s and accretion columns perpendicular to the
rotational axis which have the same structure and luminosity (within
2the error estimates) but opposite polarity of the magnetic field.

N.M.Shakhovskoy, Crimaen Astrophysical Observatory, (shakh@crao.crimea.ua)
      Nauchny, Crimea, 334413  Ukraine 
S.V.Kolesnikov, Odessa Astronomical Observatory, (astro@paco.odessa.ua)
      Park Shevchenko, Odessa, 370014 Ukraine

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