Bibcode
Rodríguez-Gil, P.; Martínez-Pais, I. G.; de la Cruz Rodríguez, J.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 395, Issue 2, pp. 973-978.
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5
2009
Citations
17
Refereed citations
16
Description
We present time-resolved spectroscopy and circular spectropolarimetry of
the SW Sex star RXJ1643.7+3402. We find significant polarization levels
exhibiting a variability at a period of 19.38 +/- 0.39 min. In addition,
emission-line flaring is found predominantly at twice the polarimetric
period. These two findings are strong evidences in favour of the
presence of a magnetic white dwarf in the system. We interpret the
measured periodicities in the context of our magnetic accretion model
for SW Sex stars. In contrast with LS Pegasi - the first SW Sex star
discovered to have modulated circular polarization - the polarization in
RXJ1643.7+3402 is suggested to vary at 2(ω - Ω), while the
emission lines flare at (ω - Ω). However, a 2ω/ω
interpretation cannot be ruled out. Together with LS Peg and V795 Her,
RXJ1643.7+3402 is the third SW Sex star known to exhibit modulated
circular polarization.
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Rodríguez Gil