EDP Sciences
Free access
Volume 372, Number 1, June II 2001
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010478

A&A 372, L1-L4 (2001)
DOI: 10.1051/0004-6361:20010478

Discovery of circular polarization in the Intermediate Polar 1WGA J1958.2+3232

M. Uslenghi1, L. Tommasi2, A. Treves2, V. Piirola3 and P. Reig4, 5

1  Istituto di Fisica Cosmica "G.Occhialini", CNR, Via Bassini 15, 20133 Milano, Italy
2  Università degli Studi dell'Insubria, Polo di Como, Via Valleggio 11, 22100 Como, Italy
3  Tuorla Observatory, SF21500 Piikkio, Finland
4  Foundation for Research and Technology -Hellas, 710 10 Heraklion, Crete, Greece
5  Physics Department, University of Crete, 710 03 Heraklion, Crete, Greece

(Received 26 January 2001 / Accepted 31 March 2001)

We report on UBVRI polarimetry of the recently identified Intermediate Polar 1WGA J1958.2+3232 , carried out on 2000 August, 4-6 at the Nordic Optical Telescope. Circular polarization was detected in R and I bands with an increasing absolute mean value with wavelength. There is evidence of possible modulation of the circular polarization at twice the previously reported white dwarf spin period, suggesting that it is the true period and that the modulation in optical and X-ray is dominated by the first harmonic. Indication of modulation at the orbital period is also present.

Key words: stars: individual: 1WGA J1958.2+3232 -- novae, cataclysmic variables -- binaries: close -- stars: magnetic fields -- polarization

Offprint request: M. Uslenghi, uslenghi@ifctr.mi.cnr.it

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