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Title:
SDSS J142625.71+575218.3: The First Pulsating White Dwarf with a Large Detectable Magnetic Field
Authors:
Dufour, P.; Fontaine, G.; Liebert, James; Williams, Kurtis; Lai, David K.
Affiliation:
AA(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , .), AB(Département de Physique, Université de Montréal, CP 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada; .), AC(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , .), AD(Department of Astronomy, University of Texas at Austin, Austin, TX 78712; .; NSF Astronomy and Astrophysics Postdoctoral Fellow.), AE(Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064; .)
Publication:
The Astrophysical Journal, Volume 683, Issue 2, pp. L167-L170. (ApJL Homepage)
Publication Date:
08/2008
Origin:
UCP
ApJ Keywords:
Stars: Abundances, Stars: Atmospheres, stars: individual (SDSS J1426+5752), Stars: Magnetic Fields
DOI:
10.1086/591672
Bibliographic Code:
2008ApJ...683L.167D

Abstract

We report the discovery of a strong magnetic field in the unique pulsating carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered at the MMT and Keck telescopes, we infer a surface field of Bs~=1.2 MG, based on obvious Zeeman components seen in several carbon lines. We also detect the presence of a Zeeman-splitted He I λ4471 line, which is an indicator of the presence of a nonnegligible amount of helium in the atmosphere of this ``hot DQ'' star. This is important for understanding its pulsations, as nonadabatic theory reveals that some helium must be present in the envelope mixture for pulsation modes to be excited in the range of effective temperature where the target star is found. Out of nearly 200 pulsating white dwarfs known today, this is the first example of a star with a large detectable magnetic field. We suggest that SDSS J142625.71+575218.3 is the white dwarf equivalent of a rapidly oscillating Ap star.
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