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Title:
PG1258+593 and its common proper motion magnetic white dwarf counterpart
Authors:
Girven, J.; Gänsicke, B. T.; Külebi, B.; Steeghs, D.; Jordan, S.; Marsh, T. R.; Koester, D.
Affiliation:
AA(Department of Physics, University of Warwick, Coventry CV4 7AL), AB(Department of Physics, University of Warwick, Coventry CV4 7AL), AC(Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany), AD(Department of Physics, University of Warwick, Coventry CV4 7AL), AE(Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany), AF(Department of Physics, University of Warwick, Coventry CV4 7AL), AG(Institut für Theoretische Physik und Astrophysik, University of Kiel, 24098 Kiel, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 404, Issue 1, pp. 159-165. (MNRAS Homepage)
Publication Date:
05/2010
Origin:
WILEY
Astronomy Keywords:
binaries: general, stars: luminosity function, mass function, stars: magnetic fields, white dwarfs
DOI:
10.1111/j.1365-2966.2010.16315.x
Bibliographic Code:
2010MNRAS.404..159G

Abstract

We confirm SDSSJ130033.48+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 +/- 3pc, where the angular separation of 16.1 +/- 0.1arcsec corresponds to a minimum binary separation of 1091 +/- 7au. SDSSJ1300+5904 is a cool (Teff = 6300 +/- 300K) magnetic white dwarf (B ~= 6mG). PG1258+593 is a DA white dwarf with Teff = 14790 +/- 77K and logg = 7.87 +/- 0.02. Using the white dwarf mass-radius relation implies the masses of SDSSJ1300+5904 and PG1258+593 are 0.54 +/- 0.06 and 0.54 +/- 0.01Msolar, respectively, and therefore a cooling age difference of 1.67 +/- 0.05Gyr. Adopting main-sequence lifetimes from stellar models, we derive an upper limit of 2.2Msolar for the mass of the progenitor of PG1258+593. A plausible range of initial masses is 1.4-1.8 Msolar for PG1258+593 and 2-3 Msolar for SDSSJ1300+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 SDSSJ1300+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.
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