Journal Article

Spectroscopic evidence for two-pole accretion in the intermediate polar RX J0558+5353

M. D. Still, S. R. Duck and T. R. Marsh

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 299, issue 3, pages 759-767
Published in print September 1998 | ISSN: 0035-8711
Published online September 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01796.x
Spectroscopic evidence for two-pole accretion in the intermediate polar RX J0558+5353

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Abstract

We report on time-series optical spectrophotometry of the low-inclination intermediate polar RX J0558+5353. This object exhibits coherent continuum and Hα line variations on both the orbital and white dwarf spin cycles. Despite the absence of a well-determined conjunction phase, the spectroscopic ephemeris combined with a favourable comparison with better-studied systems suggests that the impact between gas stream and accretion disc, or magnetosphere, drives orbital phenomena. Continuum variations over the spin cycle are consistent with previous broad-band data and indicate that accretion occurs on two poles of the primary star. We find no significant spin pulsations in the integrated line emission, but do detect variations in the resolved line profiles of Hα. Pulsed profiles are also suggestive of two-pole accretion. Double-peaked Hα line profiles and the non-detection of beat behaviour between the orbital and spin frequencies provide evidence for partial-disc transport in the system.

Keywords: accretion, accretion discs; line: profiles; binaries: close; stars: individual: RX J0558.0+5353; novae, cataclysmic variables; X-rays: stars

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Subjects: Astronomy and Astrophysics

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