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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. ISSN 0004-6361

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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

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:

Date	Event
3 June 2009	Published

Volume:

Vol.50

Number:

No.2

Number of Pages:

Page Range:

pp. 867-872

Identification Number:

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)

References:

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