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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 Gaensicke, 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
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 |
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| 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: |
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| 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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