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PG1258+593 and its common proper motion magnetic white dwarf counterpart

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Girven, Jonathan, Gaensicke, B. T., Kuelebi, B., Steeghs, D., Jordan, S., Marsh, T. R. and Koester, Detlev (2010) PG1258+593 and its common proper motion magnetic white dwarf counterpart. Monthly Notices of the Royal Astronomical Society, Vol.404 (No.1). pp. 159-165. doi:10.1111/j.1365-2966.2010.16315.x

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.16315.x

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Abstract

We confirm SDSS J130033.48+590407.0 as a common proper motion companion to the well-studied hydrogen-atmosphere (DA) white dwarf PG1258+593 (GD322). The system lies at a distance of 68 +/- 3 pc, where the angular separation of 16.1 +/- 0.1 arcsec corresponds to a minimum binary separation of 1091 +/- 7 au. SDSS J1300+5904 is a cool (T-eff = 6300 +/- 300 K) magnetic white dwarf (B similar or equal to 6 mG). PG1258+593 is a DA white dwarf with T-eff = 14790 +/- 77K and log g = 7.87 +/- 0.02. Using the white dwarf mass-radius relation implies the masses of SDSS J1300+5904 and PG 1258+593 are 0.54 +/- 0.06 and 0.54 +/- 0.01M(circle dot), respectively, and therefore a cooling age difference of 1.67 +/- 0.05 Gyr. Adopting main-sequence lifetimes from stellar models, we derive an upper limit of 2.2M(circle dot) for the mass of the progenitor of PG 1258+593. A plausible range of initial masses is 1.4-1.8 M-circle dot for PG1258+593 and 2-3M(circle dot) for SDSS J1300+5904. Our analysis shows that white dwarf common proper motion binaries can potentially constrain the white dwarf initial mass-final mass relation and the formation mechanism for magnetic white dwarfs. The magnetic field of SDSS J1300+5904 is consistent with an Ap progenitor star. A common envelope origin of the system cannot be excluded, but requires a triple system as progenitor.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Double stars, White dwarf stars, Stars -- Magnetic fields, Stars -- Luminosity function, Stars -- Masses
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 1 May 2010
Dates:
DateEvent
1 May 2010Published
Volume: Vol.404
Number: No.1
Number of Pages: 7
Page Range: pp. 159-165
DOI: 10.1111/j.1365-2966.2010.16315.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR)
Grant number: 50 OR 0802 (DLR)
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