Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372..945k&link_type=abstract
Astronomy and Astrophysics, v.372, p.945-951 (2001)
Astronomy and Astrophysics
Astrophysics
2
Stars: Magnetic Fields, Novae, Cataclysmic Variables, Stars: Individual: Rx J0203.8+2959, Accretion, Accretion Disks, Polarization
Scientific paper
We present results of the first simultaneous UBVRI-photopolarimetric observations of the long period (4.6 hrs) AM Herculis system RX J0203.8+2959. The observed circular polarization shows both negative and positive polarization, from +7% to -5% in the B-band. A rise of the positive circular polarization is observed near the same orbital phase as a change in HR1 hardness ratio from soft to hard in the earlier ROSAT X-ray observations. The negative circular polarization is observed near orbital phases where a soft X-ray component was seen in ROSAT observations. Linear polarization pulses coincide with the sign reversal of the circular polarization, and coincide also with changes in the X-ray hardness ratio in earlier ROSAT data. The observed polarization variations favour two-pole accretion. Least square fits to the position angle curves during linear pulses suggest high orbital inclination, estimates from i = 67deg+21-24 to i = 73deg+13-15. The UBVRI-lightcurves show smooth variations with a broad maximum and minimum. RX J0203.8+2959 was in intermediate accretion state during observations in November 1998 (V= 15.7 - 16.7). The observed flux and circular polarization variations are reproduced by using constant temperature cyclotron emission models having two accretion regions and with parameters: kT = 10 keV, Λ = 105 and colatitude beta = 120deg-140deg for the negative pole, and kT = 20 keV, Λ = 104 and beta = 20deg-30deg for the main accreting positive pole, and assuming orbital inclination i ~ 70deg.
Anderlucci E.
Katajainen Seppo
Lehto Harry J.
Piirola Vilppu
Scaltriti Franco
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