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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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WRAP_STeeghs_White_Dwarf_counterpart_1001.1359v1.pdf - Submitted Version Download (3645Kb) | Preview |
Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.16315.x
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 | ||||
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| 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: |
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| 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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