Journal Article

The magnetic SW Sextantis star RX J1643.7+3402

P. Rodríguez-Gil, I. G. Martínez-Pais and J. De La Cruz Rodríguez

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 2, pages 973-978
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14585.x
The magnetic SW Sextantis star RX J1643.7+3402

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We present time-resolved spectroscopy and circular spectropolarimetry of the SW Sex star RX J1643.7+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 RX J1643.7+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, RX J1643.7+3402 is the third SW Sex star known to exhibit modulated circular polarization.

Keywords: accretion, accretion discs; magnetic fields; polarization; binaries: close; stars: individual: RX J1643.7+3402; novae, cataclysmic variables

Journal Article.  4140 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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