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1RXS J173021.5-055933 : a cataclysmic variable with a fast-spinning magnetic white dwarf

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De Martino, Domitilla, Matt, Giorgio, Mukai, Koji, Bonnet-Bidaud, Jean-Marc, Falanga, M., Gänsicke, B. T. (Boris T.), Haberl, F., Marsh, T. R., Mouchet, M., Littlefair, S. P. and Dhillon, V. S.. (2008) 1RXS J173021.5-055933 : a cataclysmic variable with a fast-spinning magnetic white dwarf. Astronomy & Astrophysics, Vol.481 (No.1). pp. 149-159. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20078368

Abstract

Aims. We present the first X-ray observations with the XMM-Newton and INTEGRAL satellites of the recently discovered cataclysmic variable 1RXS J173021.5-055933, together with simultaneous UV and coordinated optical photometry aiming at characterising its broad-band temporal and spectral properties and classifying this system as a magnetic one. Methods. We performed a timing analysis of the X-ray, UV, and optical light curves to identify and to study the energy dependence of the fast 128 s pulsation over a wide energy range. X-ray spectral analysis in the broad 0.2−100 keV X-ray range was performed to characterise the peculiar emission properties of this source. Results. We find that the X-ray light curve is dominated by the spin period of the accreting white dwarf in contrast to the far-UV range, which turns out to be unmodulated at a 3σ level. Near-UV and optical pulses are instead detected at twice the spin frequency. We identify the contributions from two accreting poles that imply a moderately inclined dipole field allowing, one pole to dominate at energies at least up to 10 keV, and a secondary that instead is negligible above 5 keV. X-ray spectral analysis reveals the presence of multiple emission components consisting of optically thin plasma with temperatures ranging from 0.17 keV to 60 keV and a hot blackbody at ∼90 eV. The spectrum is also strongly affected by peculiar absorption components consisting of two high-density (∼3 × 1021 cm−2 and 2 × 1023 cm−2) intervening columns, plus a warm absorber. The last is detected from an OVII absorption edge at 0.74 keV, which suggests that photoionization of pre-shock material is also occurring in this system. Conclusions. The observed properties indicate that the accretor in 1RXS J173021.5-055933 is a white dwarf with a likely weak magnetic field, thus confirming this cataclysmic variable as an intermediate polar (IP) with one of the most extreme spin-to-orbit period ratios. This system also joins the small group of IPs showing a soft X-ray reprocessed component, suggesting that this characteristics is not uncommon in these systems.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars, Magnetic stars, X-ray sources, Galactic
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	April 2008
Volume:	Vol.481
Number:	No.1
Page Range:	pp. 149-159
Identification Number:	10.1051/0004-6361:20078368
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Agenzia spaziale italiana [Italian Space Agency] (ASI), Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Instituto de Astrofísica de Canarias
Grant number:	I/023/05/0 (ASI), PP/D002370/1 (PPARC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3449