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Post common envelope binaries from the SDSS VI. SDSS J120615.73+510047.0 : a new low accretion rate magnetic binary

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Schwope, A. D. (Axel D.), Gomez-Moran, A. Nebot, Schreiber, Matthias R. and Gänsicke, B. T. (Boris T.) (2009) Post common envelope binaries from the SDSS VI. SDSS J120615.73+510047.0 : a new low accretion rate magnetic binary. Astronomy & Astrophysics, Vol.50 (No.2). pp. 867-872. doi:10.1051/0004-6361/200911699

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Official URL: http://dx.doi.org/10.1051/0004-6361/200911699

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Abstract

We report the discovery of the ninth pre-polar consisting of a late-type ZAMS secondary and a magnetic white dwarf. The white dwarf accretes at an extreme low rate, $\dot{M} \sim 10^$ $M_\odot$ yr-1, from the wind of the companion donor star. The source was found in our systematic search for WD/MS binaries within SDSS/SEGUE. Based on seven Sloan spectra we estimate a binary period of ~200, 230, or 270 min. The UV to IR spectral energy distribution was decomposed into a dM3-dM4 ZAMS secondary and a cool white dwarf, ~9000 K, which consistently imply a distance between 360 and 420 pc. The optical spectrum displays one pronounced cyclotron hump, likely originating from a low-temperature plasma, ~1 keV, in a field of 108 MG. We comment on the evolutionary link between polars and pre-polars.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Sloan Digital Sky Survey, Accretion (Astrophysics) -- Research, Double stars -- Research, Spectral energy distribution, Low temperature plasmas
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 3 June 2009
Dates:
DateEvent
3 June 2009Published
Volume: Vol.50
Number: No.2
Number of Pages: 6
Page Range: pp. 867-872
DOI: 10.1051/0004-6361/200911699
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR)
Grant number: 50OR0404 (DLR)

Data sourced from Thomson Reuters' Web of Knowledge

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