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An in-depth study of the pre-polar candidate WX Leonis Minoris
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Vogel, J., Schwope, A. D. (Axel D.) and Gänsicke, B. T. (Boris T.) (2007) An in-depth study of the pre-polar candidate WX Leonis Minoris. Astronomy & Astrophysics, Vol.464 (No.2). pp. 647-658. doi:10.1051/0004-6361:20066099 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20066099
Abstract
Optical photometry, spectroscopy, and XMM-Newton ultraviolet and X-ray observations with full phase coverage are used for an in-depth study of WXLMi, a system formerly termed a low-accretion rate polar. We find a constant low-mass accretion rate, ˙M ∼ 1.5 × 10−13 M yr−1, a peculiar accretion geometry with one spot not accessible via Roche-lobe overflow, a low temperature of the white dwarf, Teff < 8000 K, and the secondary very likely Roche-lobe underfilling. All this lends further support to the changed
view on WXLMi and related systems as detached binaries, i.e. magnetic post-common envelope binaries without significant Rochelobe overflow in the past. The transfer rate determined here is compatible with accretion from a stellar wind. We use cyclotron spectroscopy to determine the accretion geometry and to constrain the plasma temperatures. Both cyclotron spectroscopy and X-ray
plasma diagnostics reveal low plasma temperatures below 3 keV on both accretion spots. For the low-m˙ , high-B plasma at the accretion spots in WXLMi, cyclotron cooling dominates thermal plasma radiation in the optical. Optical spectroscopy and X-ray timing reveal atmospheric, chromospheric, and coronal activity at the saturation level on the dM4.5 secondary star.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | X-ray sources, Galactic, Stars -- Magnetic fields, Double stars | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | March 2007 | ||||
Dates: |
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Volume: | Vol.464 | ||||
Number: | No.2 | ||||
Page Range: | pp. 647-658 | ||||
DOI: | 10.1051/0004-6361:20066099 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Particle Physics and Astronomy Research Council (Great Britain) (PPARC) | ||||
Grant number: | FKZ 50 OR 0404 (DLR) |
Data sourced from Thomson Reuters' Web of Knowledge
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